A comprehensive look at Texas topaz, detailing its gemological and compositional characteristics and providing a basis for using trace element concentrations to identify its origin. Bohemian Garnets ...

This article examines the origins of gemstone treatment. Using such primary sources as Pliny's History and the relatively unknown Stockholm Papyrus, the author has uncovered many ancient references to ...

This large Australian light opal cabochon weighs 117.85 carats. Small play-of-color flashes of orange and green predominate in a pinfire pattern, with spots of a more muted blue over a grayish ...

Lapis lazuli has been mined from the Coquimbo Region of Chile since 1905. Some of this material approaches the quality of fine lapis lazuli from Afghanistan. The Chilean material is composed of blue ...

Large quantities of rubies—both rough and faceted—from a commercially important new source in Myanmar (Burma) have been available on the Bangkok market since 1992. The ruby crystals from the Mong Hsu ...

Laser sawing of diamonds is beginning to revolutionize the diamond-cutting industry. Not only does the laser saw offer savings in time and money, but it also enables the cutting of material virtually ...

Visit GIA in Booth #9-10 in the Networking Area at AGS Conclave where we will be demonstrating the GIA iD100™ Gem Testing Device and showcasing the latest information on GIA Alumni Collective, ...

John Rakovan, Gloria A. Staebler, and Donald A. Dallaire, Eds., 124 pp., publ. by Lithographie LLC, Denver, 2013. US$35.00. As with other titles in this series, this work is a collection of articles ...

Garnet comes in as wide a variety of sizes and shapes as it does colors. Garnets are a group that includes a number of different minerals, so appearance can vary widely. The first thing a buyer of ...

The cover of the newly published book, William Ruser: The Jeweler Who Charmed Hollywood, written GIA Research Librarian Judy Colbert and Co-Author Peggy Tsiamis. First book about the jeweler to the ...

钻石有着悠久的历史，是人们梦寐以求的珍品。 公元一世纪，古罗马博物学家普林尼（Pliny）说：“钻石不仅是宝石中最有价值的，而且是这个世界所有事物中最有价值的。“ 一颗钻石在最终 ...

Diamond is available in a range of sizes and qualities to fit every consumer's tastes. One of the first things most people learn about diamonds is that not all diamonds are created equal. In fact, ...