July Birthstone: A Complete Guide to Ruby

There's a reason rubies have coveted for centuries. More than just the birthstone of July, ruby is the stone of passion, protection, and power. Its deep crimson hues evokes warmth, confidence, and desire—making it one of the most meaningful and luxurious gems to give or wear. 

July Birthstone: A Complete Guide to Ruby

July Birthstone: The Complete Guide to Ruby

What Is the Birthstone for July?

Ruby is the birthstone for July. Called the king of gems for over 2,000 years, from the burning red stones described in ancient Sanskrit texts to the legendary Burmese pigeon's blood rubies that still set auction records today, ruby has consistently ranked among the world's most coveted and culturally significant gemstones. Chemically, ruby is a variety of corundum, the same parent mineral as sapphire, and what makes it red is trace chromium within the crystal structure. With a Mohs hardness of 9, second only to diamond among natural gemstones, ruby is exceptionally durable and ideal for daily wear in every jewelry format including engagement rings.

For July-born buyers and those choosing a July birthday gift, ruby is a birthstone with no ambiguity in its cultural position. It is one of the four precious gemstones. Fine untreated rubies are among the most expensive gems by weight in existence, with individual stones regularly achieving prices at auction that exceed comparable diamonds. This guide covers ruby color grading, origin premiums, treatments, and how to choose ruby jewelry that holds its beauty and value over time.

Ruby — July's Traditional Birthstone

Ruby is a variety of the mineral corundum, aluminum oxide, colored by trace amounts of chromium substituting for aluminum in the crystal lattice. Chromium is what gives ruby its red color, and the same element produces the strong red fluorescence under ultraviolet light that makes fine ruby appear to glow with an inner fire in natural daylight. This fluorescence, particularly strong in material from Burma, is one of the key optical properties that separates truly exceptional ruby from merely excellent red corundum.

The boundary between ruby and pink sapphire is one of the most debated topics in colored gemstone grading. Both are red corundum. Both are colored by chromium. The distinction is purely one of saturation: stones with sufficient depth of red to be classified as ruby rather than pink sapphire command dramatically higher prices, and the line is drawn differently by different laboratories, different markets, and different traditions. GIA requires a minimum level of red saturation before classifying a stone as ruby, while some Asian markets apply a more inclusive standard. For buyers, the practical implication is that any significant ruby purchase above a few hundred dollars per carat should be accompanied by a certificate from a recognized laboratory confirming the ruby classification.

The Meaning and Symbolism of Ruby

Ruby's symbolic associations are among the most consistent and intense of any gemstone. In virtually every culture that has valued it, ruby has been associated with the life force itself: blood, fire, passion, and the vital energy that animates living beings.

In ancient Hindu cosmology, ruby was called ratnaraj, the king of precious stones, and was believed to be the most sacred gem. The Mahabharata describes ruby as a self-luminous stone, and the Vedic tradition associated it with the sun, with kingship, and with the protection of the divine order. It was believed that ruby's inner fire would warm cold water and dissolve the darkness around it.

In ancient Burma, warriors embedded rubies beneath their skin before battle, believing the stone made them invincible. This belief in ruby's protective power against injury persisted across Southeast Asian military traditions for centuries. Medieval European tradition associated ruby with nobility, power, and the ability to foretell danger: rubies were said to darken when their owner faced mortal threat.

Contemporary symbolism of ruby centers on love, passion, and courage, the most intense emotional states associated with being fully alive. It is the traditional gift for fortieth wedding anniversaries and is given to mark milestones that represent a life's great commitments. Ruby red in Western culture is inseparable from the language of the heart.

A Brief History of Ruby

The oldest and most culturally central ruby deposits in the world are in the Mogok Valley of upper Myanmar, known historically as Burma, where rubies have been mined for at least two thousand years. The Mogok Stone Tract produced the rubies that supplied the gem trades of ancient India, the Islamic world, and eventually the European courts and crown jewels. The rubies in the coronation regalia of England, France, and the Holy Roman Empire are overwhelmingly of Burmese origin.

Sanskrit texts from the fourth century BCE describe ruby as the most precious of all stones and attribute to it the ability to light up the darkness. The stone appears in the Bible as the emblem of wisdom and virtue: the book of Proverbs asks who can find a virtuous woman, for her price is far above rubies.

In Renaissance Europe, ruby was the gem most associated with royalty and divine authority. The Black Prince's Ruby in the British Imperial State Crown, which is now known to be a spinel rather than a ruby, illustrates how completely ruby and ultimate power were associated in the European imagination: the stone was assumed to be a ruby for five centuries simply because it was inconceivable that the most prominent gem in the English crown jewels could be anything else.

The twentieth century saw the Mogok deposits supplemented by new sources, first in Thailand and Sri Lanka, then by the transformative discovery of the Montepuez deposit in Mozambique in 2009, which has become the most significant new ruby source in a generation and has supplied a substantial portion of the world's fine ruby production since then.

The Color of Ruby

What Makes a Fine Ruby Red

Ruby's red color comes from chromium, which absorbs blue and yellow wavelengths of light and transmits red. The concentration of chromium determines the intensity of the color: too little produces the lighter pink stones classified as pink sapphire; the right amount produces vivid, medium-to-dark red; too much can produce a brownish or overly dark stone that loses its brilliance. The ideal ruby sits in a narrow range of chromium concentration that produces pure, vivid, saturated red without muddiness or excessive darkness.

Iron is also present in most rubies, and its interaction with chromium significantly affects the final color. High iron content typically produces a darker, slightly brownish or orange-red color. Low iron content allows chromium's pure red to dominate. The combination of high chromium and low iron, which is characteristic of the finest Burmese Mogok material, produces the specific color that defines what the market means by great ruby.

Pigeon's Blood — The Most Coveted Color

Pigeon's blood is the trade term for the most prized ruby color, a pure, vivid, slightly bluish-red with high saturation and strong red fluorescence. The term originated among Burmese gem miners, who described the ideal color as resembling the first two drops of blood from a freshly killed pigeon, a color that sits at the purest point of the red spectrum with a slight blue undertone that intensifies the perceived redness.

Fine pigeon's blood rubies from Mogok are distinguished not only by their hue and saturation but by their fluorescence: chromium in Mogok material is unusually pure, and the resulting fluorescence under ultraviolet light and in natural daylight causes the stone to glow red from within. This fluorescence adds a dimension of perceived color intensity that goes beyond simple saturation and is visible in ordinary daylight, giving fine Mogok rubies a quality that has no direct equivalent in any other gemstone.

The term pigeon's blood has been adopted by major gemological laboratories as a quality descriptor. GIA and Gübelin both issue reports using the pigeon's blood designation for stones that meet the color standard, which adds the designation significant weight as a market indicator. A ruby described as pigeon's blood on a Gübelin or GRS certificate commands a substantial premium over a fine ruby of similar quality that does not achieve the designation.

How Color Saturation Affects Value

Color saturation is the dominant value driver in ruby, more so than clarity, which is accepted at relatively high inclusion levels compared to diamond or even emerald. A vivid, deeply saturated pigeon's blood ruby with moderate inclusions commands significantly more per carat than a cleaner, better-cut stone with weaker, less saturated color.

The ideal saturation for ruby sits in the medium to medium-dark range. Stones that are too light slide toward pink sapphire classification and lose ruby's premium. Stones that are too dark absorb so much light that they appear nearly black in low-light conditions, losing the vivid brilliance that makes ruby so compelling. The best rubies maintain their color in all lighting conditions, appearing equally vivid under sunlight, candlelight, and fluorescent light.

Where Ruby Comes From

Burma (Myanmar) — The Gold Standard

The Mogok Valley in Mandalay Region, Myanmar, is the most historically significant and most prestigious ruby origin in the world. Mogok rubies, produced in marble-hosted deposits by metamorphic processes that concentrate chromium-bearing corundum in an unusually pure geological environment, display the combination of vivid red color, low iron content, and strong fluorescence that defines the pigeon's blood standard.

Mogok rubies with certified Burmese origin command a consistent premium over equivalent stones from other origins. At the auction level, the premium for Burmese origin can be 100 percent or more over comparable Mozambican material, reflecting the accumulated cultural weight of Mogok's two-thousand-year history and the particular optical properties of its stones.

The Mong Hsu deposit in Shan State, also in Myanmar, has been a significant commercial producer since the early 1990s. Mong Hsu rubies typically have a strong blue core that requires heat treatment to produce uniform red color, and they are generally less valued than Mogok material, though fine examples from Mong Hsu exist and are used extensively in commercial jewelry.

Mozambique, Thailand, and Madagascar

The Montepuez ruby deposit in Cabo Delgado Province, Mozambique, discovered in 2009 and operated at scale by Gemfields, has transformed the modern ruby market. Montepuez produces rubies in a range of qualities from commercial to fine, with the best material showing vivid red color that rivals top-tier Burmese material in color grade if not in fluorescence intensity. Mozambican rubies generally have higher iron content than Mogok material, which reduces the red fluorescence characteristic of Burmese stone, but the finest examples achieve pigeon's blood classification from major laboratories and have sold at auction for prices that reflect fine ruby quality regardless of origin.

Thailand's Chanthaburi and Trat provinces have historically been among the most important ruby-cutting and trading centers in the world, and Thai deposits have produced significant commercial-grade material. Thai rubies tend toward darker, more brownish-red colors due to higher iron content, and they are associated primarily with commercial rather than collector-grade material.

Sri Lanka, the historic source of the finest large rubies now in museum and private collections, produces material across a wide quality range. Sri Lankan rubies tend toward lighter tones and sometimes toward pinkish colors at the boundary with pink sapphire. The country's long mining history means that large, fine Sri Lankan rubies of historical provenance appear periodically at auction and achieve significant prices.

Madagascar produces rubies from several deposits in varying quality levels. Ilakaka, known primarily as a sapphire source, also produces ruby. More recently, deposits near Andilamena have attracted attention for material with color qualities approaching Mozambican fine ruby.

Ruby Hardness and Durability

Ruby rates 9 on the Mohs hardness scale, making it the second hardest natural gemstone after diamond and sharing this rating with sapphire, its corundum family sibling. This hardness means ruby resists scratching from virtually everything encountered in everyday life, including quartz dust and most metallic surfaces.

Ruby's toughness, its resistance to fracture under impact, is also excellent. Unlike emerald, which has numerous inclusions that create fracture planes, and unlike topaz, which has perfect cleavage, ruby fractures rather than cleaves and is structurally robust under normal jewelry wear conditions. This combination of extreme hardness and good toughness makes ruby one of the most suitable colored gemstones for intensive daily wear, including in rings and bracelets that receive frequent contact.

The inclusions that are common in ruby, particularly the rutile silk inclusions that produce a characteristic haziness in unheated material and the fingerprint inclusions of healed fractures, do not significantly reduce the stone's structural integrity in most cases. Very heavily included stones or stones with large fractures may be more vulnerable to impact, but fine to commercial quality rubies with typical inclusion patterns are robust.

Ruby Treatments

Heat Treatment: Industry Standard

More than 95 percent of rubies in the commercial and fine jewelry market have been heat-treated to improve color and clarity. The treatment involves heating ruby rough or finished stones to temperatures between 1,200 and 1,800 degrees Celsius, which dissolves rutile silk inclusions and improves color by modifying the oxidation state of iron and other trace elements. The result is a cleaner, more vivid stone with improved light performance.

Heat treatment of ruby is universally accepted in the trade, is permanent and stable under all normal wearing conditions, and is required to be disclosed at sale. The presence of heat treatment does not indicate lower-quality material in the way it might with some other gemstones: even many of the world's finest rubies are heated, and heat-treated rubies with exceptional color and origin regularly sell for very high prices at major auctions. The distinction that matters is between heat treatment alone and more invasive treatments that add foreign material to the stone.

Lead Glass Filling: Lower Quality

Lead glass filling is a more invasive treatment in which rubies with significant fractures are filled with lead-rich glass to improve apparent clarity. The glass, which has a refractive index close to ruby's, becomes visually invisible within the fractures and can dramatically improve the appearance of heavily included material that would otherwise have limited commercial value.

Lead glass-filled rubies are significantly less valuable than heat-treated or untreated stones and require specific disclosure. The treatment is not stable: the glass can be damaged by household chemicals, acids including lemon juice, and ultrasonic cleaning, which can cause the glass to cloud or dissolve and leave visible pits in the stone's surface. Gemological identification of lead glass filling requires laboratory examination. Buying any ruby of significant value, meaning above a few hundred dollars, from a reputable jeweler who can provide laboratory certification prevents accidental purchase of glass-filled material.

Why Untreated Ruby Commands Premium Prices

Untreated rubies, described on laboratory reports as no heat or unheated, command substantial premiums over heat-treated stones of comparable visual quality. At the fine ruby level, the premium for untreated material can range from 30 to 300 percent or more depending on quality and origin, reflecting the genuine rarity of fine ruby that requires no enhancement to achieve its color and the collector preference for natural, unmodified stones.

An untreated Burmese ruby of fine quality with pigeon's blood color and a Gübelin or GRS certificate confirming Burmese origin and no heat treatment is among the most valuable objects per gram in the natural world. Record auction prices for colored gemstones are overwhelmingly held by rubies of this description.

Ruby vs. Spinel — The Famous Confusion

The relationship between ruby and spinel is one of the most interesting stories in gemological history, and it has been covered in the context of August's birthstone as well, because spinel is one of August's official birthstones partly in recognition of the confusion.

For centuries, ruby and red spinel were classified together under the name balas ruby, a term that acknowledged their visual similarity without distinguishing their mineral identity. The technology to reliably distinguish corundum from spinel did not exist until the development of modern gemological instruments in the twentieth century, and this means that many of the most famous rubies in history are actually spinels.

The Black Prince's Ruby in the British Imperial State Crown, one of the most celebrated gems in the world, is a 170-carat red spinel. The Timur Ruby in the British Royal Collection, another famous red stone with an equally storied history, is also a spinel. These misidentifications persisted for centuries not through negligence but because the stones were genuinely indistinguishable with the technology available.

For modern buyers, the practical implication is that any significant red stone should be certified by a recognized gemological laboratory to confirm its mineral identity. Natural ruby and fine red spinel are both valuable and collectible, but their markets are different and their prices are not equivalent. Red spinel, though significantly rarer than ruby in fine quality, has not historically commanded ruby prices, making certified ruby the more predictable store of value.

How to Choose July Birthstone Jewelry

Ruby Engagement Rings

Ruby engagement rings are among the most romantic and historically resonant jewelry choices available. The association of ruby with passion, love, and the vital force of life makes it a symbolically powerful alternative to diamond, and its hardness of 9 on the Mohs scale means it is one of the few colored gemstones that approaches diamond's suitability for intensive daily wear without special handling.

For a ruby worn daily as an engagement ring, prong settings that show the maximum amount of the stone work beautifully and are structurally safe given ruby's excellent toughness. Bezel settings provide additional protection for the girdle and work particularly well for oval and cushion-cut rubies in vintage-inspired designs. A halo of white diamonds surrounding a ruby center stone creates strong visual contrast and protects the center stone's edges.

Treatment grade matters for a long-term piece. A heat-treated ruby with a laboratory certificate confirming heat treatment only and no glass filling is an appropriate choice for an engagement ring at virtually any quality level. For buyers investing at the fine ruby level, an untreated stone with certified Burmese origin is the most prestigious option.

Metal choice significantly affects ruby's visual impact. Yellow gold creates a warm contrast that has been the traditional setting for ruby throughout history. White gold and platinum provide a cooler contrast that makes the ruby's red appear more vivid. Rose gold creates a harmonious warm aesthetic that is particularly popular in contemporary designs.

Ruby for Everyday Wear

Ruby's durability makes it as practical as it is beautiful for daily jewelry in all formats. Ruby stud earrings, pendants, and bracelets require no special handling in everyday use and can be worn continuously without concern for scratching or surface wear.

For everyday rings, ruby performs better than almost any colored gemstone except sapphire. A simple bezel or prong-set ruby ring in 14-karat or 18-karat gold can withstand daily wear for decades with appropriate maintenance. The most common issue with ruby rings in daily wear is not damage to the stone but wear to the setting itself, particularly prong tips, which should be inspected annually and re-tipped as needed.

Commercial-grade heat-treated ruby in accessible price ranges provides attractive red color for everyday jewelry at significantly lower prices than fine collector-grade material. For buyers who want ruby's color and symbolism in a daily piece without collector-level investment, commercial heat-treated ruby set in gold represents excellent value.

Ruby as an Heirloom Gift

Ruby's position as the most coveted colored gemstone over more than two thousand years of jewelry history, and its association with the most intense human experiences of love, courage, and vitality, makes it among the most meaningful choices for a gift intended to carry significance across generations.

For a significant heirloom purchase, a laboratory certificate from GIA, Gübelin, or GRS is not optional. The certificate documents the stone's origin, treatment status, and quality characteristics in a way that preserves its provenance and value for whoever owns it next. A fine ruby with a Gübelin certificate confirming Burmese origin, no treatment or heat treatment only, and pigeon's blood color designation is a self-contained record of the stone's identity that outlasts any jeweler's verbal assurance.

The combination of high per-carat value, exceptional hardness, and centuries of cultural significance means that a fine ruby, properly cared for, is genuinely among the most durable stores of beauty in the material world.

July Zodiac Signs and Their Birthstones

Cancer (June 21 to July 22)

Cancer is a water sign ruled by the Moon, associated with emotional depth, nurturing instincts, and intense loyalty to those within its circle. The pairing between Cancer and ruby is not immediately obvious given the sign's watery, lunar character, but it reflects a deeper truth about Cancer's emotional intensity: the sign feels everything fully and protects those it loves with fierce devotion. Ruby's symbolism of passionate protection and the fiery courage that love generates is entirely consonant with Cancer at its most committed.

Traditional Cancer stones include pearl, moonstone, and ruby, with the first two reflecting the sign's lunar and oceanic associations and ruby representing the fierce, protective fire that burns beneath the surface of a sign that presents softness to the world but defends its loved ones absolutely.

Leo (July 23 to August 22)

Leo is a fire sign ruled by the Sun, associated with generosity, radiance, leadership, and a natural authority that commands attention without effort. Ruby is among the most Leonine of all gemstones: warm, brilliant, vivid, impossible to overlook, and historically associated with royalty and the divine right to lead. The connection between Leo and ruby is intuitive to anyone who has spent time with either the sign or the stone.

Traditional Leo stones include ruby, amber, and citrine, all warm-toned stones that reflect the sun's energy. For a Leo, ruby is not merely a birthstone but a statement of character: this is a stone that makes no apology for its intensity, that demands to be seen, and that has been recognized as something extraordinary for as long as human beings have noticed beautiful things.

Caring for Ruby Jewelry

Ruby's exceptional hardness makes it one of the most forgiving gemstones in terms of care requirements, but routine maintenance keeps it looking its best and prevents the most common causes of deterioration.

Clean ruby jewelry with warm water, a few drops of mild dish soap, and a soft brush. Work carefully around prong settings where grease and debris accumulate between the stone and the metal. Rinse thoroughly with clean water and dry with a soft cloth. Ultrasonic cleaners are safe for heat-treated rubies that have no fractures reaching the surface and no glass filling. If there is any uncertainty about the treatment status of a ruby, hand cleaning is always the conservative choice.

The most important exception to ultrasonic cleaning is lead glass-filled rubies, which must never be cleaned with ultrasonic equipment or steam, and must not be exposed to household acids, solvents, or strong cleaning chemicals. If you have any ruby that you have not had laboratory-certified and you are uncertain of its treatment status, assume glass filling is possible and treat it accordingly.

Inspect ring settings annually. Ruby's hardness means the stone itself rarely requires attention, but the metal settings, particularly prong tips, wear down over time and can loosen their grip on the stone. A visual inspection by a jeweler once a year, with re-tipping of worn prongs as needed, is the single most important maintenance practice for ruby rings worn daily.

Store ruby jewelry away from other gemstones, including other rubies. Despite ruby's hardness, two ruby surfaces in contact can abrade each other, and ruby can scratch softer stones in storage. Individual compartments in a fabric-lined box or soft pouches are appropriate storage for each piece.

Avoid exposing ruby to sudden temperature extremes. While ruby handles normal temperature variation without concern, moving a stone directly from a very cold to a very hot environment creates thermal stress that can propagate existing internal fractures. This is primarily a concern for stones with significant inclusions or surface-reaching fractures.

Ruby Favorites at The Solist

  • Gübelin: Explore museum-worthy rubies with an origin as compelling as their design.

  • Fabergé: Whimsical settings that pair ruby with enamel and diamonds.

  • Damiani: Sleek and modern Italian elegance with a pop of passionate red.

  • Bulgari: Iconic designs infused with Roman glamour and bold color.

Celebrate a July Birthday (Or Just Yourself)

Whether you’re honoring a July birthday or simply falling for the ruby’s romance, now is the time to indulge. At The Solist, our ruby selection is curated for the discerning collector—each piece designed to dazzle for generations.

Frequently Asked Questions

What is July's birthstone?

Ruby is the birthstone for July. It symbolizes love, passion, courage, and vitality.

What color is the July birthstone?

Ruby ranges from pinkish-red to deep blood-red. The most prized rubies have a vivid, slightly bluish-red color known in the trade as pigeon's blood.

Is ruby a precious or semi-precious stone?

Ruby is one of the four precious gemstones, alongside diamond, sapphire, and emerald. Fine untreated rubies are among the most expensive gemstones by weight, with exceptional examples regularly exceeding the per-carat price of comparable diamonds at auction.

How hard is ruby on the Mohs scale?

Ruby rates 9 on the Mohs scale, second only to diamond among natural gemstones. It is exceptionally durable and suitable for all jewelry types including engagement rings and daily-wear bands.

What does ruby symbolize?

Ruby symbolizes love, passion, and courage. It has been called the king of gems for over two thousand years and was historically believed to protect warriors in battle. It is the traditional gift for fortieth wedding anniversaries.

What is pigeon's blood ruby?

Pigeon's blood refers to the most coveted ruby color: a pure, vivid, slightly bluish-red with high saturation and strong red fluorescence. The term originated from Burmese gem miners and remains the gold standard for ruby color grading, recognized as an official designation by major gemological laboratories including GIA, Gübelin, and GRS.

Is ruby a good engagement ring stone?

Excellent. Ruby's hardness of 9 on the Mohs scale makes it one of the most durable colored gemstones available, well-suited for daily wear in engagement rings with any setting style.

Are most rubies treated?

Yes. Over 95 percent of rubies on the market are heat-treated to improve color and clarity. Heat treatment is permanent, stable under all normal conditions, and disclosed at sale. Untreated rubies command significant premium prices. Lead glass filling is a more invasive treatment that should be disclosed and that requires specific care.

Why do some rubies look pink?

There is no scientific boundary between pink sapphire and ruby: both are red corundum colored by chromium. The trade convention is that lighter pinkish stones are classified as pink sapphire while sufficiently saturated red stones are classified as ruby. The line is drawn differently by different laboratories and in different markets.

Is Burmese ruby the best?

Burmese ruby from the Mogok Valley has historically commanded the highest prices due to its characteristic pigeon's blood color and natural fluorescence. Mozambique ruby from the Montepuez deposit has emerged as a major modern source with comparable color quality at the fine level, and the finest Mozambican material achieves pigeon's blood classification from major laboratories.