The unusual six-rayed trapiche pattern, identified mainly with Muzo emeralds, has also been discovered in Mogok sapphires and Mong Hsu rubies.

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

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

Picturesque beaches and lush green jungles are not the only attractions that make Bali the most popular tourist destination in Indonesia.

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

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

Inclusions resembling snowflakes, and hues of many colors, are two characteristics seen in fine-quality jadeite specimens on offer at the Tucson gem show.

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.

On February 5, 2020, Gems & Gemology launched a Facebook group dedicated to gemology and research published in the journal.

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

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

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

An overview of the Spring 2020 Gems & Gemology content.

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?