Ruby Meaning, Symbolism & July Birthstone Guide

A ruby is corundum — aluminum oxide — that is red. That is the whole definition.

Pure corundum is colorless. According to the GIA, chromium is the trace element that gives ruby its red, and the strength of the red depends on how much chromium is present. Chromium also causes fluorescence — the stone absorbs ultraviolet light and re-emits it as red — which is why the finest rubies seem to glow from inside in daylight rather than merely reflect.

The name comes from the Latin ruber, red. Ruby’s older name says more about how it was regarded: in Sanskrit it is ratnaraj, the king of gems.

Why are ruby and sapphire the same mineral?

Because they are. Red corundum is ruby. Every other color of corundum — blue, pink, yellow, purple, green, colorless — is sapphire. Change the trace element and you change the name of the gem, not the mineral.

Which raises a question with real money attached: where exactly does pink stop and red begin?

There is no universally agreed answer. The GIA classifies as ruby only corundum with a dominant red hue, and states plainly in its own material that not everyone agrees on the division between ruby and pink sapphire. The International Colored Gemstone Association has historically taken the opposite view — that light red is still red, and therefore still ruby.

Why this matters to you as a buyer. A borderline stone sits on a price cliff. The same piece of corundum can be graded ruby by one laboratory and pink sapphire by another, and the market treats those two words very differently. If you are paying ruby money for a light, pinkish stone, ask which laboratory called it a ruby — and read the report rather than the sales tag.

Related: Sapphire Meaning & September Birthstone

Ruby’s symbolism follows its color. Red is blood, fire, heat and life, and every culture that valued the stone read it that way.

• Passion and love. Ruby’s association with romantic devotion is the reason it marks the 40th wedding anniversary — the milestone at which a marriage is understood to be still burning, not merely enduring.
• Vitality and courage. Burmese warriors are traditionally said to have carried rubies into battle, believing the stone made them invincible. Ruby has long been the soldier’s talisman.
• Protection. In medieval Europe, ruby was traditionally believed to warn its wearer of coming misfortune by darkening.
• Royalty and power. Ratnaraj, king of gems. Ruby was the stone of kings across South Asia, the Middle East and Europe — and the red stones in most historic crowns were understood to be rubies, whether or not they actually were. (The 170-carat “Black Prince’s Ruby” in the British Imperial State Crown is, famously, a spinel.)

These are traditional beliefs and cultural associations, recorded across centuries of folklore. They are part of why people choose the stone. They are not claims about what a gemstone can do for your health, your relationships or your finances, and we will not present them as such.

Yes. Ruby is the official birthstone for July, and July is one of the seven months with a single official stone — no alternatives, no ambiguity. That list is published by Jewelers of America, the organization that standardized it in 1912.

It is also, per the GIA, the gem of both the 15th and 40th wedding anniversaries — which makes ruby unusually useful. Most gemstones carry one occasion. Ruby carries three: a birthday, a fifteenth, and a fortieth.

Related: Birthstones by Month: All 12 Explained · Anniversary Jewelry by Year

Yes — and this is the most under-appreciated thing about the stone.

Two properties decide whether a gem survives daily life, and they are not the same:

• Hardness (the Mohs scale) is resistance to scratching.
• Toughness is resistance to chipping, cracking and breaking.

Plenty of gems are hard but not tough. Emerald is the classic failure case: Mohs 7.5–8, yet brittle enough to fracture against a door frame. Topaz and tanzanite have cleavage planes and split. Ruby has neither problem. At Mohs 9 with excellent toughness and no cleavage, it is — with sapphire — the most robust colored gemstone in fine jewelry.

In the workshop this changes what we can design. A soft or brittle stone forces our hand: bezel, halo, pendant. A ruby lets us do whatever the design wants. An open six-prong that lets light through the pavilion, a raised cathedral shoulder, a sharp calibré channel with no metal edge to shield it — all of it is on the table, because the stone can take it.

There is exactly one thing that ruins this. And it is the reason most of this article exists.

Because a composite ruby is not durable at all, and it is sold at the price of a bargain rather than the price of a warning.

Here is what happens. Low-grade ruby rough — corundum so fractured and cloudy it could never be faceted as a normal stone — is heated with lead-rich glass. The molten glass flows into the cracks and cavities. The stone comes out looking clearer, redder and larger. In many specimens, glass makes up a substantial fraction of the finished stone by volume.

“Mohs 9” now tells you nothing. The corundum is still Mohs 9. But the object in the setting is a mosaic of corundum fragments held together by glass — and the glass is what fails. The hardness rating describes the mineral. It does not describe the thing you are wearing.

The trade’s position on this is not ambiguous:

• The GIA will not issue a ruby report for most of this material. It issues an identification report describing it as a manufactured product consisting of glass and ruby, notes that the product is known to be unstable, and states that it requires special care.
• The US Federal Trade Commission’s Jewelry Guides (16 CFR Part 23, revised 2018) bar marketers from using an unqualified gemstone name for a composite product, and specifically say that calling it “treated ruby” is not sufficient disclosure. Any qualified term must convey that the product does not have the same characteristics as the named stone and that it requires special care. The Jewelers Vigilance Committee’s example of a compliant description is blunt: composite ruby – lead-glass-filled – special care required.
• GIA researchers who tested the material for Gems & Gemology found the filler reasonably resistant to the heat of ordinary jewelry repair — but that it reacted readily with solvents.

What that means at our bench

This is the part no affiliate buying guide will tell you, because it only shows up on the other side of a jeweler’s counter.

A composite ruby cannot safely go through the routine, unremarkable things that happen to a ring over thirty years. Resizing. Retipping a worn prong. A pickle bath. An ultrasonic clean. In some cases, a household cleaner splashed on it at the kitchen sink. Ordinary maintenance that a real ruby shrugs off can cloud a composite, etch it, or take it apart.

So the piece becomes unrepairable. Not “expensive to repair” — unrepairable, because the act of repairing it is what destroys it. A customer arrives with an inherited ring, we look at it under magnification, and we have to explain that the stone cannot be touched. That conversation is the reason we set natural stones and say so.

The five things sold as “ruby”

The two to keep apart in your head are rows three and four. A lab-grown ruby is real ruby — same chemistry, same hardness, same toughness — that grew in a factory instead of the ground. A composite ruby is natural ruby that has been structurally compromised. The lab-grown stone is the honest inexpensive option. The composite is the one that breaks.

The question to ask a seller is not “is this treated?” — everything is treated. Ask: “Is this stone lead-glass filled or a composite?” and “Is it safe for resizing, retipping and ultrasonic cleaning?” You want yes or no. A vague answer is an answer.

Related: Natural vs Lab-Grown Gemstones · How to Tell if a Gemstone Is Real

It is also not a grade.

There is no harmonized industry standard behind the phrase. Different laboratories apply it by different rules — some restrict it to unheated Burmese stones, some award it on color alone regardless of origin or treatment, and the GIA does not put it in the color field of its reports at all. At its 2016 congress, CIBJO — the World Jewellery Confederation — devoted a session to precisely this problem, and its Coloured Gemstone Commission observed that consumers believe pigeon’s blood is an industry standard or a quality grade when it is not.

The practical consequence is that “pigeon’s blood” on a product listing, with no laboratory report behind it, is marketing language. It tells you what the seller would like you to believe about the color. It does not tell you what any independent party concluded.

If it matters to you, the report is the claim — not the label. And if it doesn’t matter to you, a fine red ruby without the phrase attached will cost a great deal less and look nearly the same on a hand.

Two auction results tell the whole story of the last decade — and they do not point the same way.

• The Sunrise Ruby, 25.59 carats, Burmese, sold at Sotheby’s Geneva in May 2015. The GIA records the price as $1,266,901 per carat — a record for a colored gemstone.
• The Estrela de Fura, 55.22 carats, Mozambican, sold at Sotheby’s New York in June 2023 for $34.8 million, the highest total ever paid for a ruby or any colored gemstone at auction — at $630,288 per carat.

Read those two numbers together. Mozambique now holds the record for the biggest ruby result in history. Burma still holds the record for the most valuable single carat. Origin has not stopped mattering — it has stopped being the only thing that matters.

A note for US buyers on Burmese ruby

US sanctions currently target Myanma Gems Enterprise, the state entity that oversees gemstone activity in Myanmar. This is an entity-based restriction rather than the blanket import ban that ran from 2008 to 2016 — but because that entity sits across the country’s gem permitting, a genuinely clean Burmese supply chain is difficult to establish, and the US Treasury has warned that Burmese stones are routinely cut and re-labeled in third countries.

Sanctions change. If a seller offers you a “Burmese ruby,” ask for its documentation and its import history, and check the current position rather than relying on any article — including this one. We are jewelers, not attorneys, and this is not legal advice.

This is our territory, so we will be specific.

Deco jewelers treated colored stones as architecture. Ruby wasn’t a centerpiece so much as a structural line — calibré-cut, meaning custom-cut to fit a shape exactly, then channel-set edge to edge so no metal interrupts the color. A ribbon of red running beside a row of baguette diamonds. A red frame against black onyx. High contrast, hard geometry, no softness.

Ruby is uniquely suited to this because it is hard, tough and has no cleavage. Calibré-cutting means sharp corners and thin proportions, and a channel setting leaves those corners exposed. Try that in emerald or tanzanite and you will be replacing stones. Ruby simply takes it.

The thing most people get wrong about vintage ruby

Here is a genuinely counterintuitive fact about period jewelry, and it costs collectors money every year.

Many rubies in authentic Art Deco and Edwardian pieces are synthetic — on purpose, and it does not make the piece a fake.

Ruby was the first gemstone ever produced synthetically at commercial scale. The French chemist Auguste Verneuil announced his flame-fusion process in 1902, and by the 1920s fine synthetic corundum was everywhere in high jewelry — used deliberately, by the best houses, because a calibré border needs a dozen stones of identical color and flawless clarity, and nature does not supply those in matched sets. Period jewelers considered synthetic ruby an improvement for that job, not a compromise.

So a Verneuil ruby in a 1925 piece is not evidence of a reproduction. It is evidence of a 1925 piece. What tells you whether a Deco jewel is real is the construction — hand-applied milgrain, die-struck rather than cast, the tool marks of hand fabrication — not whether the accent stones grew underground.

Our own work is made with natural gemstones set in solid gold, and we say which is which. But if you are valuing, restoring or buying vintage, know that the period rule was different — and that a dealer who calls a period synthetic a “fake” is telling you something about the dealer.

Related: What Is Art Deco Jewelry? · Art Deco & Vintage Engagement Rings · French Cut vs Baguette · What Is Milgrain?

1. Color decides the price. Nothing else comes close. Look for a red that stays red — not brownish, not orangey, not so dark it goes black in low light. Then check it in daylight: chromium fluorescence should make it lift, not sit flat.
2. Accept inclusions. Ruby is a Type II stone: some visible inclusions are normal and expected. A “flawless” natural ruby at a modest price is a warning, not a bargain. Fine silk (rutile needles) is often a good sign — it is evidence of slow natural growth.
3. Ask the treatment question in the right words. Not “is it treated?” Ask: “Is it lead-glass filled or composite?” and “Is it safe for ultrasonic cleaning and resizing?”
4. For anything significant, get an independent report. GIA, AGL, SSEF, Gübelin. The report is the claim; the tag is an opinion.
5. Choose the metal for the effect you want. Yellow gold warms a ruby and pushes it toward orange-red; white gold and platinum sharpen it and hold the red pure. Neither is correct — they are different pieces.
6. Then, and only then, think about carat. A smaller ruby of fine color will outshine a larger dull one on the hand, every time.

Related: Colored Gemstone Engagement Rings · Engagement Ring Settings Guide

For a natural ruby, heated or not: warm water, mild dish soap, a soft brush. That is genuinely all it needs. Ruby is not sensitive to light, heat, or ordinary household chemistry, and it does not scratch against anything you are likely to own.

Ultrasonic and steam cleaning are generally safe for natural and heat-treated rubies — and are not safe for lead-glass composites, which can cloud, etch or come apart. If you do not know which you have, do not put it in the machine. Soap and water cost nothing and risk nothing.

Related: How to Clean Gemstone Jewelry at Home · Fine Jewelry Care Guide

Easy, because the stone itself asks nothing of you: Mohs 9, tough, no cleavage, soap and water, wear it forever. Hard, because the word “ruby” is doing an enormous amount of work in the market — stretching across an unheated Burmese stone worth a million dollars a carat, a lab-grown stone worth almost nothing, and a lead-glass composite that will not survive its own resizing.

The color is the romance. The paperwork is the purchase.