The July birthstone is ruby — and among all birthstones, few carry as much visual impact, historical weight, or symbolic resonance as this one. Called ratnaraj in ancient Sanskrit, meaning "king of precious stones," ruby is one of only four gemstones classified as precious alongside diamond, emerald, and sapphire. Its deep red color has captivated royalty, warriors, poets, and collectors for thousands of years.
This guide covers everything you need to know about the July birthstone: its history, meaning, color, properties, what makes one ruby more valuable than another, and how to care for ruby jewelry.
What Is the July Birthstone?
The July birthstone is ruby — a variety of the mineral corundum colored red by trace amounts of chromium. The name comes from the Latin word ruber, meaning red. Every color of corundum other than red is classified as sapphire — which means that ruby and sapphire are, mineralogically, the same stone in different colors.
The modern birthstone list was standardized in 1912 by the American National Association of Jewelers. Ruby's place on that list as July's birthstone followed centuries of tradition — ruby had appeared on historical birthstone lists including those tied to the Breastplate of Aaron and early Hindu astrological charts long before any modern standardization existed.
The History of Ruby
Ancient India and Asia
Ruby was called ratnaraj — king of gemstones — in ancient India, where Hindu texts described it as the most precious of all gems, associated with blood, power, and vital energy. Rubies were traded along China's North Silk Road as early as 200 BC, spreading their value across Asia long before any Western records existed.
Burma (Myanmar): The Greatest Source
Myanmar's Mogok Valley has produced the world's finest rubies for over five centuries and remains the global benchmark for ruby quality. Burmese warriors reportedly embedded rubies into their skin before battle, believing them to provide invincibility. As the Mogok mines depleted, the Mong Hsu region began producing rubies in the 1990s — though these typically require treatment before reaching the market.
Medieval Europe
Medieval Europeans believed rubies could predict misfortune by darkening in color and cure inflammatory diseases. For centuries, any red stone was called a ruby until around 1800, when ruby was specifically identified as a variety of corundum. The Black Prince's Ruby — long considered one of the largest rubies in the Crown Jewels of England — was eventually determined to be red spinel.
Modern History
Ruby's red fluorescence helped build the first working laser in 1960 and remains in use in lasers, watches, and medical instruments today.
Ruby Meaning and Symbolism
Ruby's symbolism is consistent across cultures: passion, love, protection, power, and prosperity.
Love and passion Ruby's deep red — the color of blood and the heart — has made it a universal symbol for romantic love and intense emotion, widely considered the stone of the heart.
Protection. From Burmese warriors embedding rubies in their skin to medieval Europeans wearing them against misfortune, ruby has a long history as a protective talisman, its fiery red seen as a warning to threats.
Power and royalty. Indian maharajas, European monarchs, and Chinese emperors all coveted rubies as markers of status and authority. Fine rubies remain among the most expensive gemstones per carat in the world today.
Prosperity. Ruby was widely believed to attract wealth and good fortune. Vedic astrologers held that it boosted mental strength and drew prosperity to the wearer.
Ruby is traditionally given for 15th and 40th wedding anniversaries and July birthdays.
Ruby Color: What Makes a Ruby Valuable
Color is the single most important factor in determining a ruby's value — more so than clarity, cut, or carat weight in most cases.
Pigeon's Blood Red
The most prized ruby color is called "pigeon's blood" — a vivid, pure red with a slight purple hint that appears to glow from within. Chromium, which gives ruby its red color, also causes fluorescence under ultraviolet light, making some rubies appear to emit their own light in daylight. This fluorescence in a deeply saturated stone dramatically increases both visual impact and value.
Color Range
Natural rubies range from:
- Vivid pure red — the most valuable, typically from Myanmar's Mogok mines
- Purplish red — slightly cooler tone, still very desirable
- Orangey red — warmer undertone, common in rubies from certain Thai and East African sources
- Pinkish red — the borderline between ruby and pink sapphire, which affects value significantly
The line between ruby and pink sapphire remains debated. GIA and most labs use color saturation thresholds to distinguish the two, but no universally agreed boundary exists. Some stones marketed as rubies would be classified as pink sapphires under stricter grading standards.
Why Even Distribution Matters
Color distribution across the stone affects value significantly. A ruby with uneven color is worth considerably less than one with uniform saturation throughout. Evaluating the stone face-up under natural daylight gives the most accurate read of color distribution.
Ruby Properties
Hardness and Durability
Ruby ranks 9 on the Mohs hardness scale — second only to diamond. It resists scratching from virtually every material encountered in daily life and has no cleavage, meaning it won't split when struck. This makes ruby one of the strongest choices for everyday jewelry wear — more durable than emerald and comparable to sapphire, which shares its corundum mineral base.
Origin and Sources
Myanmar's Mogok Valley remains the benchmark for fine ruby quality — vivid red stones with strong fluorescence that command the highest prices. Other significant sources include:
- Mozambique — Montepuez mines produce rubies comparable to Mogok; the most commercially significant new source
- Vietnam — Luc Yen region produces red to purplish red stones
- Sri Lanka — Tends toward pinkish red tones
- Thailand and Cambodia Historically important border-region sources
- Madagascar, Tanzania, Kenya — Emerging African sources
A certified Mogok ruby with documented Burmese provenance commands a meaningful premium over equivalent stones from other sources.
Inclusions and the "Silk" Effect
Inclusions are widely accepted in rubies — and some are desirable. Fine needle-like rutile inclusions called "silk" are common in high-quality natural rubies and help authenticate a stone as natural rather than synthetic. When silk inclusions align parallel to each other in a cabochon-cut ruby, they create asterism — a six-pointed star visible under direct light. Star rubies are a distinctive and collectible subset of the ruby category.
Treated vs Natural Rubies
The vast majority of rubies sold today have been heat treated — and this is the widely accepted, disclosed industry standard. Heat treatment removes purplish coloration from rubies, producing a purer red, and can also improve clarity by dissolving certain types of silk inclusions.
Approximately 90% of rubies on the commercial market have been heat treated. An untreated ruby with strong color and good clarity is genuinely rare and commands a significant premium over equivalent heat-treated stones — sometimes 50-100% or more for exceptional specimens.
Beyond heat treatment, some lower-quality rubies undergo more intensive treatments including fracture filling with glass or other materials to improve clarity. These treatments are less stable, less accepted in the trade, and require different care than untreated or heat-treated stones. Glass-filled rubies should only be cleaned with a damp cloth rather than ultrasonic or steam cleaners.
Always ask for disclosure of any treatments applied and, for significant purchases, request independent gemological certification confirming treatment status. For a full breakdown of gemstone treatments and what they mean for buyers, read our guide on treated vs untreated gemstones.
Lab-Grown Rubies
Lab-grown rubies have the same chemical, physical, and optical properties as natural rubies — they're composed of the same corundum mineral with the same chromium coloring agent. They're created under controlled laboratory conditions using processes that replicate natural ruby formation, producing stones that are visually and structurally identical to natural rubies.
The practical difference for buyers: lab-grown rubies are significantly less expensive than natural rubies of equivalent color, clarity, and carat weight — often 70-90% less for comparable visual quality. For jewelry where the ruby's beauty and durability are the primary considerations rather than its natural provenance and rarity, lab-grown rubies represent genuine value.
Lab-grown rubies are also consistently available in larger carat sizes without the rarity premium that drives natural ruby pricing sharply upward above 1-2 carats. At Fascinating Diamonds, all lab-grown rubies are clearly identified as such with full disclosure of their origin.
How to Choose Ruby Jewelry
Color First
Start with color — specifically the richness and evenness of the red. A vivid, evenly saturated red with good depth and a natural internal glow indicates higher quality. Avoid rubies that appear dull, washed out, or heavily zoned, where some areas are vivid and others pale or grayish.
Eye-Clean is the Clarity Goal
Natural inclusions are accepted and expected in rubies. The practical goal is eye-clean: no inclusions visible to the naked eye when viewed face-up at normal distance. Avoid rubies with visible cloudiness or large, prominent fractures.
Cut for Color
A well-cut ruby maximizes color saturation and minimizes color extinction — zones that appear dark rather than red under normal lighting. The cut should also allow the stone's natural fluorescence to activate, making the ruby appear to glow from within. Round, oval, cushion, and emerald cuts are the most common shapes. For rings, a bezel or six-prong setting provides the best protection — see our guide on most secure engagement ring settings.
Carat and Rarity
High-quality rubies above 1 carat are genuinely rare. Above 2 carats with fine color and minimal treatment, natural ruby can exceed diamond pricing per carat. Budget accordingly, particularly for center stones in fine jewelry settings.
Ruby Jewelry: Best Styles and Settings
Ruby's rich red color works beautifully across a wide range of jewelry formats and metal tones.
With yellow gold: The warmth of yellow gold deepens the ruby's red and creates a rich, historical aesthetic reminiscent of Victorian and Mughal-era jewelry. This combination has centuries of precedent in fine jewelry traditions from India through Europe.
With white gold or platinum: The cool contrast of white metal makes the ruby's red appear more vivid by contrast — a sharp, graphic combination that suits contemporary settings. Diamond accents alongside ruby in white gold settings are particularly striking, the diamond's brilliance amplifying the ruby's deep color.
With rose gold: Rose gold's warm pink tone creates an intimate, complementary relationship with ruby red. The two warm colors harmonize rather than contrast, producing a softer, more romantic overall look.
For ruby engagement rings — an increasingly popular choice for July birthdays and anyone drawn to colored gemstone center stones — bezel and six-prong settings provide the best protection for a stone that, while durable at Mohs 9, still benefits from secure, well-maintained settings in daily wear. For guidance on ruby wedding band styles specifically, see our guide on different types of ruby wedding bands.
Ruby Care and Maintenance
Ruby is one of the most durable gemstones available, but proper care extends the life of both the stone and its setting.
Cleaning: For most rubies, warm water with mild dish soap and a soft-bristled brush is the safest cleaning method. Ultrasonic and steam cleaners are generally safe for untreated and heat-treated rubies, but should not be used on glass-filled or fracture-filled stones, where the heat and vibration can damage or dislodge the filling material.
Storage: Store ruby jewelry separately from other pieces in a fabric-lined pouch or compartment. Although ruby is very hard and won't be scratched by most other materials, it can scratch softer gemstones it contacts.
Daily wear: Remove ruby jewelry before heavy manual work, gardening, or high-impact sports — not because the stone is vulnerable, but to protect the setting. Check prongs and settings periodically to ensure no loosening has occurred.
What to avoid: Harsh chemicals, bleach, and prolonged exposure to extreme heat. Keep ruby jewelry away from direct sunlight for extended periods, particularly if the setting contains other gemstones or organic materials that may be more light-sensitive than the ruby itself.
Final Thoughts
Ruby earns its status as the king of colored gemstones. Its deep red color carries more cultural history, symbolic weight, and emotional resonance than almost any other stone in fine jewelry — from ancient India's sacred texts to medieval European court jewelry to contemporary fine jewelry collections. Its Mohs 9 hardness makes it one of the most practical choices for jewelry meant to be worn and loved daily, not just admired in a case.
Whether you're drawn to ruby as a July birthstone, a 15th or 40th anniversary gift, or simply the most passionate of all colored gemstones, the right ruby — vivid in color, clear to the eye, well-cut to show its natural glow — is one of the most genuinely impressive pieces of fine jewelry available.
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Frequently Asked Questions
What is the July birthstone?
The July birthstone is ruby. It is a variety of the mineral corundum colored red by trace amounts of chromium — the same mineral family as sapphire, with the key distinction that only red corundum is classified as ruby. It ranks 9 on the Mohs hardness scale, making it one of the most durable gemstones for everyday jewelry.
What does the July birthstone mean?
Ruby symbolizes passion, love, protection, power, and prosperity. Its deep red color has been associated with the heart, with blood, and with life force across virtually every culture that has valued the stone. Ruby is traditionally seen as a symbol of intense romantic love, a protective talisman against danger, and a marker of royal power and authority.
What color is the July birthstone?
Ruby ranges from vivid pure red to purplish red, orangey red, and pinkish red. The most prized color is called "pigeon's blood" — a vivid, saturated red with a slight purple hint that appears to glow from within. The chromium content determines the depth of red, and many rubies also display strong natural fluorescence that enhances their apparent brightness in daylight.
Is ruby the most expensive gemstone?
Fine natural rubies are among the most expensive gemstones per carat in the world, and exceptional specimens regularly exceed diamond prices at equivalent sizes. This is primarily due to rarity — high-quality natural rubies above 2 carats with vivid color, minimal inclusions, and documented untreated status are genuinely scarce.
What is pigeon's blood ruby?
Pigeon's blood is a trade term for the most prized ruby color: a vivid, pure red with a slight purplish hint and strong fluorescence that makes the stone appear to glow from within. The term originated in Burma (Myanmar) and is associated specifically with the finest rubies from the Mogok mines. Gemological laboratories including GIA use the term in their reports to describe rubies that meet the specific color criteria.
Are most rubies heat treated?
Yes. Approximately 90% of commercial rubies are heat treated to improve color and clarity — this is the widely accepted, disclosed standard practice in the industry. Untreated rubies of comparable quality command a significant premium. More intensive treatments like glass filling are also used on lower-quality stones and require different care. Always ask for treatment disclosure and certification for significant purchases.
Can you wear ruby every day?
Yes. Ruby's Mohs 9 hardness and lack of cleavage make it one of the most durable gemstones for daily wear — second only to diamond in practical toughness. Ruby is well-suited for rings, bracelets, and other jewelry formats subject to regular contact and impact. Annual inspection of settings is recommended for any daily-wear fine jewelry.
What is a star ruby?
A star ruby is a ruby that displays asterism — a six-pointed star visible across the stone's surface when light strikes it directly. The star is caused by parallel silk inclusions (rutile needles) within the stone that reflect light in a specific pattern. Star rubies are typically cut as cabochons rather than faceted stones to showcase the optical effect.
What is the difference between natural and lab-grown ruby?
Natural rubies are mined from the earth and formed over millions of years under geological conditions. Lab-grown rubies are created in controlled laboratory environments and have identical chemical, physical, and optical properties to natural rubies. The visual result is the same; the difference is origin and price — lab-grown rubies cost significantly less than natural rubies of equivalent quality, making them an accessible alternative for buyers who prioritize the stone's beauty and durability over natural provenance.