CVD法は、天然ダイヤモンドの形成方法と全く異なります。 CVD法では、非常に低い圧力の真空チャンバー内で、炭化水素ガス（通常はメタン）と水素との加熱混合物からダイヤモンドを生成します。

バンコクはタイの宝石産業の財政の中心地かもしれませんが、心は、ほとんどの石がいまだにカットされているチャンタブリにあります。

Explores the usefulness of this technique in the mapping of defects and spectral features, the determination of color origin, and the identification of synthetic and treated diamond melee.

A study on how infrared spectroscopy provides conclusive evidence of impregnated moonstone.

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

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.

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

The Gem Testing Laboratory of Jaipur, India, received for identification an opaque blue specimen, submitted as sapphire.

Two small, near-colorless stones reportedly from Myanmar were loaned to GIA for examination.

Deep blue apatite with a cat’s-eye effect, however, is very rare.

The stone owes all of its green color to these shallow radiation stains.

ジェモロジストによる宝石鑑別を容易にしたGIAの機器開発についての概要

Why and how Shipley created GIA and its mission

Nearly 60 years after the first synthetic diamonds were produced by the General Electric (GE) Corporation, they are making an impact in the jewelry market.