Finders, Keepers: Field Trip to Crater of Diamonds, USA

There’s only one place on earth where the general public can prospect for diamonds directly from a primary kimberlite pipe: Crater of Diamonds State Park.

続きを読む

Fossil Ivory Update with Lee Downey

Lee Downey, owner of Artifactual (Tucson, Arizona), spoke with us in early 2020 about his 35 years in the fossil ivory carving trade and the impact of ivory bans on his business.

続きを読む

Occurrence of Petrified Woods in the Russian Far East: Gemology and Origin

Scientists in Russia construct an origin story through the analysis of petrified wood popularly used in the souvenir trade.

続きを読む

The “Fragility of the Eternal” Kunzite: Origin, Cutting, and Identification

A master gem carver bases his latest design off a stunning stained glass window when attempting the world’s largest known cut kunzite.

続きを読む

Greenish Blue Glass Imitating Gem Silica

Gem silica, also known as “chrysocolla chalcedony,” is considered the most valuable variety of chalcedony.

続きを読む

Purplish Pink Diaspore Reportedly from Afghanistan

Diaspore, an orthorhombic aluminum oxide hydroxide mineral with the formula AlO(OH), is a relative newcomer to the jewelry scene, with some stones possessing a captivating ability to change color between pale green, yellow, pink, and purple when viewed in different sources of light.

続きを読む

こちらもご覧ください

YMAL GIA Ed
通学やオンラインでの教育について学ぶ
Learn About NextGem
GIA ネクストジェム(NextGem) ダイヤモンド研修 小売業向け
Explore GIA Laboratory Promotional Offers
GIAラボラトリーの特別オファーを見る
Shop the GIA Store
GIAストアで ショッピング