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The Identification of Blue Diffusion-Treated Sapphires

Blue diffusion-treated sapphires are becoming more prevalent than ever before.

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 Large open mussel shell with pink interior
Article
Freshwater Pearling in Tennessee

Natural pearl identification is one of the critical problems in pearl research. The DNA study of pearly mollusks and oysters facilitates solving this problem. To fulfill this goal, GIA sent a group from both research and education to Tennessee to sample the freshwater mollusks for DNA bar coding. Come with us to Camden, Tennessee, to see how we dive for pearly shells.

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Beryllium Diffusion of Ruby and Sapphire

The heat treatment of corundum involving lattice diffusion of beryllium (Be) at temperatures over 1800°C has become a major issue in the gem trade.

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Article
Sapphire Mining Along the Upper Missouri River

A GIA team from Education and Lab Services visited the upper Missouri River sapphire deposits in Montana. The first sapphire discovery in the Treasure State, these deposits have been mined for over 150 years. The team witnessed the mining at the richest source, Eldorado Bar, and purchased a mine run to enrich GIA’s corundum collection.

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A Study of the Gems in Ciborium from Einsiedeln Abbey
A Study of the Gems in Ciborium from Einsiedeln Abbey

The gemstones that adorn a late-16th-century ciborium from Einsiedeln Abbey in Einsiedeln, Switzerland.

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Indian necklace
Article
Jewelers to the Maharajas of Jaipur and Modern-Day Moguls

Enter a world not well-known in the West—the world of the maharajas and their jewelry, coveted by the modern-day moguls of business, entertainment, and royalty. See the fantastic works of art made today in the form of enameled Kundan meena jewelry and the regal look of polki diamonds.

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Article
Jewelry that Speaks the Language of Flowers

A flower is one of nature’s most delicate delights, so it’s natural that jewelry designers have long found inspiration in them, seeking to capture their fleeting beauty in jewelry.

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Assortment of Linde synthetic star rubies and sapphires
Dual-Color Double Stars in Ruby, Sapphire, and Quartz: Cause and Historical Account

Examines a form of asterism comprising two six-rayed stars, one white and one that exhibits the stone’s bodycolor. Firsthand accounts and a survey of patent documents reveal that diffusion has been used to create or enhance this optical phenomenon in synthetic and possibly natural corundum since the 1950s.

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Article
Emeralds: Colombia’s Buried Treasure

Colombia is home to a rainbow of gems, but emeralds – and the tales of lore that surround them – are the country’s most well-known treasures.

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Sapphire
Article
Sapphire History and Lore

Traditionally, sapphire symbolizes nobility, truth, sincerity, and faithfulness.

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