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Ruby

Ruby is the most valuable variety of the corundum mineral species, which also includes sapphire.

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Fine Mogok Ruby

This fine 2.58-ct. ruby is from Myanmar’s classic Mogok deposit.

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Extraordinary

Ruby’s extraordinary red color is caused by traces of chromium.

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Mixed Cut

Like many fine rubies, this example is fashioned as a mixed cut.

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Calcite Matrix

These exceptional ruby crystals on calcite are from Mogok, Myanmar.

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Origin In Marble

The snow white calcite matrix hints at the ruby crystal’s origin in marble.

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Ruby Crystal

The characteristic form of this ruby crystal allows it to be recognized.

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Tools

Research

A large group of people outside on GIA’s Carlsbad, California  campus.
Article
Guardians of Trust: GIA’s Innovative Research, Instruments and Services

GIA’s services and instruments have grown in importance and impact as new gem treatments and laboratory-grown gems enter the market.

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Variety of rubies from northern Mozambique, 2009–2010
A Decade of Ruby from Mozambique: A Review

Reviews the mining history, market impact, and properties of ruby from northern Mozambique near Montepuez, now the world’s most productive source.

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The octopus head is a baroque Tahitian cultured pearl and its arms are made of black, yellow and white diamond (in a striped pattern) set in black-plated 18K gold.
Article
A Tropical Paradise of Ocean-Inspired Jewelry and Gemstones

Escape to a warm-water paradise in your mind with these jewels that formed in the sea, are inspired by marine life and evoke the ocean’s essence.

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A ruby and diamond choker. The center section is made of six strands of red pearls, framed by rubies and diamonds.
Article
Mughal Jewels Auction: Al-Thani Collection Raises $109 Million

Collectors from around the world descended on Christies’ Maharajas & Mughal Magnificence auction of the jewels from the Al-Thani Collection on June 19.

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Emerald and diamond brooch.
Article
Jewels of Hollywood: Accessories and Jewelry that Made the Stars Shine

“Jewels of Hollywood,” on loan from the Kazanjian Foundation, showcases some of the jewelry and accessories associated with Hollywood royalty.

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Looking down the crystal axis of a backlit 58.83 ct trapiche emerald
Article
Emerald: The Superstar of Trapiche Gemstones

Trapiche emeralds, which display a distinct six-spoke wheel pattern, set the standard as some of the finest and most spectacular crystals unearthed.

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A pile of near-colorless HPHT synthetic melee
Article
Diamond Market Forecast: Declining Credit, Soft Prices and Lab-Grown Diamonds

Despite the generally strong year for jewelry retail, the diamond industry continues to face problems with credit, spotty demand and soft prices.

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Gray Corundum Coated by Black Spinel Layer
Corundum with Spinel Corona from the Tan Huong–Truc Lau Area in Northern Vietnam

Explains the reactions responsible for the formation of a well-developed reaction rim of spinel that surrounds the corundum core in some specimens from this deposit.

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Melt inclusions in the 1.70 ct ruby from Montana
A Rare Ruby from Montana

An exceptional ruby specimen is identified with a Montana of origin in the Carlsbad lab.

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Needle-like sillimanite inclusions in ruby
Sillimanite in Ruby

Unusual needle-like inclusions in ruby were identified as sillimanite.

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