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サファイアの品質を決定する要因
Sapphire is one of the big three of colored gemstones (the other two are ruby and emerald). This durable gemstone captures jewelry buyers with its practicality and aura of romance. Click here and learn about the factors that make sapphire so desirable!
新作GIAアプリのご紹介
Learn more about the GIA App and download directly to your Apple® or AndroidTM Device.
Course Color Gem Grading Carlsbad
「奇跡につぐ奇跡」を生きる：コロンビアのエメラルド取引の30年をジェモロジストが振り返る
GIAの倉庫で初めて宝石に魅了され卒業生となった彼は、コロンビアのエメラルド専門家としての出世街道を進むことになりました。
Book Review: Collector’s Guide to the Amphibole Group
Review of Collector’s Guide to the Amphibole Group, by Robert J. Lauf.
Book Review: Cartier Royal High Jewelry and Precious Objects
Review of Cartier Royal High Jewelry and Precious Objects, by François Chaille.
Book Review: Wartski: The First Hundred and Fifty Years
Review of Wartski: The First Hundred and Fifty Years, by Geoffrey Munn.