Raman spectroscopy confirms sea-blue beads with a similar appearance to Larimar are actually quench-crackled chalcedony.

A rough diamond crystal weighing 4.05 ct was observed with radiation staining on its surface.

Examines the effectiveness of hydrogen and oxygen isotopes in discriminating dolomite-related nephrites from the four most important occurrences worldwide.

In recent decades, jadeite prices have risen dramatically. Driven by profit, a variety of imitations are found in the jadeite jewelry market.

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.

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.

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

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

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

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.

CARLSBAD, Calif. – Oct. 13 – As consumer interest in laboratory-grown diamonds increases, GIA (Gemological Institute of America) is driving its consumer-protection mission forward by introducing LGDR by GIA, a family of four new digital-only reports for laboratory-grown diamonds with 4Cs color and clarity specifications replacing the descriptive terms and grade ranges previously used on GIA reports for laboratory-grown diamonds.

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.