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

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.

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.

欠陥やスペクトルの特徴のマッピング、色の起源の判定、合成石や処理されたメレーダイヤモンドの鑑別におけるこの技術の有用性を探る。

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.

CVDや伝統的なHPHTダイヤモンド合成法で製造されたものではない、新しい高透明性合成ダイヤモンド材料の予備調査

南アフリカとボツワナの学生は、GIA（米国宝石学会）のジュニア宝石鑑定士プログラムで、宝石学、鉱物学、地質学を学ぶ。

L-Box™は、2つ以上のダイヤモンドの外観比較に使用されます。移動する物体の写真を捕捉するためにカメラが搭載されています。 画像は、高解像度又は3D映画制作のために組み合わせることができます。

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.