Evaluates a potential method of visually identifying HPHT-treated diamonds using microscopy to observe intense fluorescence at the facet edges and junctions.

Learn about ametrine's durability and how to care for your ametrine jewelry.

The world’s only commercial source of ametrine is the Anahi mine in southeastern Bolivia. Legend has it that a Spanish conquistador discovered the mine’s location in the 1600s and introduced the gem to Europeans when he presented several specimens to his queen.

Transparent, bicolored quartz with the colors of both amethyst and citrine in the same gem is called ametrine or amethyst-citrine.

Amethyst is the purple variety of the quartz mineral species and the gem most commonly associated with the color purple.

Turquoise might lack the sparkle and clarity of transparent colored gemstones like ruby, emerald, and sapphire, but its multi-layered history and soul-satisfying color make it a desirable gem. Its color can range from dull greens to grass greens to a bright, medium-toned, sky blue

周大福とGIAは、2022年10月31日をもちまして、試験段階のサービス「GIA ブロックチェーン ダイヤモンド グレーディング レポート」を中止することに決定いたしました。このレポートをお持ちのお客様は、Chow Tai Fook T Mark アプリを通じてレポートを受信できるように登録されています。本サービスの中止により、レポートの安全性が影響を受けることは一切ありません。

Learn about aquamarine's durability and how to care for your aquamarine jewelry.

Turquoise is one of the world’s most ancient gems. Archaeological excavations revealed that the rulers of ancient Egypt adorned themselves with turquoise jewelry, and Chinese artisans were carving it more than 3,000 years ago.

Typically, turquoise is judged on three basic quality factors: color, texture and the presence or absence of matrix. Learn more about turquoise and what makes this gem so sought after!

Learn about kunzite's durability and how to care for your kunzite jewelry.