Presents a study that suggests optically brightened pearls can be consistently separated from non-brightened pearls using fluorescence spectroscopy.

Presents the four major groups of defects responsible for the color in nearly all yellow and orange diamonds.

Many legends are told about the history of the Chivor emerald mine.

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

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

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

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

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

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

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.

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

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.

加利福尼亚州卡尔斯巴德– 10 月 13 日 — 随着消费者对实验室制造钻石越来越感兴趣，GIA（美国宝石研究院）进一步提升其消费者保护使命，推出了 GIA 实验室制造钻石证书 (LGDR) — 包括适用于实验室制造钻石的四种新版数字证书（仅提供数字版），证书中包含 4C 颜色和净度规格。而以前，GIA 的实验室制造钻石证书使用的是描述性术语和等级范围。

了解 GIA 如何解决业界所担忧的问题，即未经披露的实验室制造钻石和花式米粒钻仿品与天然花式米粒钻混在一起。

关于希腊劳里厄姆古代银矿的加注文献清单

对 GIA 专家而言，网络研讨会是一种轻松分享信息并与研究人员以及宝石和珠宝爱好者社区保持联系的非正式方式。

宝石学摄影记者 Robert Weldon（罗伯特·韦尔登）分享了他最喜欢的一些照片，并讲述了背后的故事。