非開示のラボラトリー グロウンおよび類似石のファンシー メレーが天然ファンシー メレーに混在していることに対する業界の懸念にGIAがどのように対処しているかについて学びましょう。

ギリシャのラウリウムにある古代の銀山に関して編集された注釈付きの書籍リスト

Webinars are an easy, informal way for GIA experts to share information and stay connected to the community of researchers and gem and jewelry lovers.

宝石学フォトジャーナリストのRobert Weldonが、お気に入りの写真に秘められた逸話を紹介します。

An overview of the Spring 2020 Gems & Gemology content.

Violent kimberlite eruptions impact the surface features of diamonds, which can give scientists useful information about how diamonds react with the fluids in the mantle.

Numerous needle-like inclusions exhibit vibrant interference colors in a suite of pallasitic peridot from the Jepara meteorite.

Orange crystal inclusion identified as the rare mineral triplite in a beryl from Pakistan.

Application of slight pressure perpendicular to the twinning planes reveals the unusual property of this synthetic gem.

Diamond formed at incredible depth shows evidence of radioactive fluids in cavities surrounded by green fluorescence halos.

A phenomenon resembling play-of-color was seen in a 4.13 ct unheated sapphire recently examined by the author.

A ring made entirely of natural diamond was recently submitted to GIA’s New York laboratory.

The Hong Kong laboratory recently examined a Burmese star ruby incorporating a significant amount of bismuth glass.

Conspicuous bright brownish red crystals in ruby matrix are the first recorded observations of staurolite in corundum.

Afghani spodumene hosts an unidentified translucent orange crystal surrounded by an iridescent cleavage halo.

Explores the art form of jade carving in China across five periods from the late Neolithic Age to the present day.

Investigates the chemical, physical, and gemological properties of attractive rhodonite-rich rocks from this Swiss deposit.

Presents a quantitative means of determining the causes of color in a gem material, using corundum’s six major chromophores as an illustration.