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The gemological and spectroscopic characteristics of these type IIa synthetic diamonds suggested that they experienced different growth and/or treatment histories.

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.

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.

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

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

Shipley 为何及如何建立 GIA 及其使命

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。

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。

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

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。