At the AGTA show, Equatorian Imports showed this contributor two pieces of emerald with a very rare double-trapiche pattern

In mid-2012, one of the international diamond grading laboratories in Antwerp reported undisclosed CVD synthetic diamonds, causing a stir in the diamond industry.

Recently, an unusual 0.94 ct Fancy yellow-brown emerald cut was submitted to GIA for a synthetic diamond grading report. It contained a cloud of black needle-like inclusions occurring along a plane and showed weak green transmission with fiber-optic illumination.

The New York laboratory recently tested a 2.16 ct CVD synthetic from Scio Diamond Technology Corp., the largest specimen GIA has seen so far.

The New York lab encountered another large HPHT-treated diamond that showed stronger pink coloration.

An overview of how GIA's instrument development helped gemologist identify gemstones

通用电气 (GE) 公司生产第一批合成钻石至今已近 60 年，他们对珠宝市场产生了巨大影响。

Shipley 为何及如何建立 GIA 及其使命

探讨这一技术在映射缺陷和光谱特征、确定颜色成因，以及鉴定合成和经处理的米粒钻方面的有效性。

Explores the fascinating history of natural pearling in Australian waters and examines the properties that might help distinguish these natural pearls from those that are accidentally produced during the culturing process.

A relatively new source of gem-quality turquoise is hosted within slates in Zhushan County of China’s Hubei Province.

This article describes the major gem materials of Vietnam, together with their new finds and recent production.

Natural-color saltwater cultured pearls (SWCPs) from Pinctada maxima were studied using UV-Vis-NIR and PL spectroscopy to better understand the mechanisms of their coloration and to separate them from other SWCPs with similar natural colors.

初步检测表明，这种高透明度的全新合成钻石材料不是通过 CVD 或传统的高温高压合成方法获得的。

在南非和博茨瓦纳开设的 GIA 少年宝石学家课程让学生初步了解宝石学、矿物学和地质学。

L-Box™ 可用来比较两颗或多颗钻石的外观，如果配备一个相机还能用来在物体移动时捕捉一系列照片。 将这些图像结合起来，可以形成一部高分辨率或 3D 电影。

The current production of cultured pearls from the black-lipped pearl oyster (Pinctada margaritifera) in the Federated States of Micronesia includes mostly beaded as well as blister and nonbead-cultured pearls in a wide array of colors.

An examination of the gemological and spectroscopic properties of CVD synthetic diamonds from Gemesis Corp.