A nondestructive rapid screening technique uses fluorescence spectroscopy to identify treated colored pearls.

Untreated Russian emeralds, rarely seen in the market, demonstrate a range of color and degree of fineness.

Mina Stones promotes Nigerian gems including rubellite and sapphire as well as reviving traditional skills and symbols in the creation of original jewelry.

A rare Burmese star peridot cabochon is characterized by a soft four-rayed asterism and extremely fine acicular inclusions.

Advanced analytic techniques are critical for separating Ethiopian feldspar from Oregonian and copper-bearing feldspar with undetermined color origin.

A delicate, ethereal necklace depicting a diamond butterfly caught in a gem-studded spider’s web won the third annual Gianmaria Buccellati Foundation student jewelry design contest.

Unusually large top-quality faceted Russian demantoid garnets with the characteristic lovely green to yellowish green color excite attention at the Tucson GJX show.

Green nephrite deposits are found at many locations around the globe, with British Columbia, Siberia, and northwestern China as the leading producers.

A transparent supply chain and the education of artisanal miners were two of the many topics discussed at Tucson’s first Ethical Gem Fair.

The Bangkok laboratory recently examined a pearl containing a laminated shell bead nucleus with mysterious properties.

In early February, despite the early phase of the COVID-19 outbreak, the Tucson shows were well attended and sales were brisk.

This year at the AGTA show, the number of booths selling skillfully carved, fantasy cut, or expertly recut items was noticeably higher than in past years.

Chrysocolla-in-chalcedony, also known as gem silica or blue chalcedony in Taiwan, is the most valuable chalcedony variety on the Taiwanese market.

カリナンダイヤモンドにまとめられたコメント付きのリーディングリスト

ベニトアイトに関して編集された注釈付きの書籍リスト

GIAの卒業生、Franco Valobraが、命を救うために新型コロナウイルスと最前線で闘う医療従事者に感謝の気持ちを表して記念のピンを制作します。

「光のパフォーマンス」という用語は、ダイヤモンド業界で漠然と使われていますが、実際にダイヤモンドを見ているとき、どのような意味があるのでしょうか?

「光のパフォーマンス」という用語は、ダイヤモンド業界で漠然と使われていますが、実際にダイヤモンドを見ているとき、どのような意味があるのでしょうか?