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Sapphire
The name “sapphire” can also apply to any corundum that’s not ruby red, another corundum variety.
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Research
Trapiche-Type Sapphire from Tasmania
A rare Tasmanian trapiche-type sapphire, found during a field expedition, is examined.
Update on Spectroscopy of “Gold Sheen” Sapphires
The chemical composition and spectroscopic characteristics of 14 gold sheen sapphires are examined.
Gem Fossicking: Recreational Mining in Australia
Fossicking is a special type of mining activity that Australians love. Australia is a large country rich in many types of gem resources. Come to Australia with the GIA field gemology team to feel the passion of gem fossicking in the southern hemisphere.
“Punsiri”-type FTIR Spectral Features in Natural Yellow Sapphires
Testing of natural-color yellow sapphires from Australia and Thailand with the FTIR features of “Punsiri” heat-treated material.
Sapphires from the Sutara Placer in the Russian Far East
Studies the formation and chemical composition of the largely unexamined alluvial sapphires from Russia’s Jewish Autonomous District.
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.
Rock Creek Montana Sapphires: A New Age of Mining Begins
Visit Montana’s Rock Creek sapphire mining area with a GIA field expedition and witness the recovery of these beautiful stones directly from the source.
Montana’s Gem Mountain Sapphire Mine: Sharing the Excitement of Mining with the Public
Join a GIA field team on an expedition to Gem Mountain, Montana, and witness the rarely seen sapphire heat treatment process and tourists passionately searching for treasures to turn into cherished jewelry.
A Fantastic Display of Phase Changes in a Sapphire’s Fluid Inclusion
Phase changes illustrate the temperature and pressure conditions in the fluid inclusion system of a Sri Lankan sapphire.
Paula Crevoshay’s American Collection, Plus Jewelry with Nontraditional Gemstones
Lesser-known gem materials are seen in pieces alongside a collection created as an artistic inheritance for future generations of jewelry fans.
Blue Sapphires From a New Deposit Near Andranondambo, Madagascar
A recent rush in Madagascar yields new sapphire production.
