The Identification of Turquoise by Infrared Spectroscopy and X-Ray Powder Diffraction

Glassy Melt Inclusions in Sapphires from Montana
Two-phase inclusions are investigated in alluvial sapphires from deposits in Montana.
Copper-Bearing Tourmalines from New Deposits in Paraíba State, Brazil
Two new deposits of Cu-bearing tourmaline have been found in Paraíba State, Brazil, not far from the original source at Mina da Batalha.
Ruby and Sapphire from the Tan Huong-Truc Lau Area, Yen Bai Province, Northern Vietnam
Primary and secondary deposits in the Tan Huong–Truc Lau area of northern Vietnam’s Yen Bai Province have supplied rubies and some sapphires for more than a decade.
Tsavorite and Other Grossulars from Itrafo, Madagascar
Since 2002, tsavorite and other grossular varieties have been recovered from a primary deposit at Itrafo, a village in the Andrembesoa area of central Madagascar.
The Gujar Killi Emerald Deposit, Northwest Frontier Province, Pakistan
Over the last decade, Pakistan has developed into an important source for many gem materials. A number of localities have been identified for emeralds in particular.
A Historic Turquoise Jewelry Set Containing Fossilized Dentine (Odontolite) and Glass
Investigating a set of six antique brooches set with diamonds and light blue cabochons.

GIAのGübelin宝石プロジェクト:様々な宝石、コーネルピン - ナトロライト
Among the collection assembled by Dr. Edward Gübelin are a number of uncommon gemstones from many worldwide localities.

GIAダイヤモンド オリジン サービス参加者
GIAのダイヤモンド オリジン サービスは、参加していただいている鉱山労働者、製造業者、卸売業者、小売業者にご協力いただき、専門家がグレーディングを行い原産国が確認された天然ダイヤモンドが最終消費者に届くことを保証します。GIAは、お客様に資するGIAダイヤモンド オリジン レポート付きダイヤモンドの調達者として、サプライチェーンに関わるあらゆる企業が互いに連携を深められるよう、以下のリストを提供します。

GIAジェムプロジェクト ジルコン
ジルコンは化学的に純粋な状態では無色透明ですが、一般的には黄褐色から褐色を呈します。また、赤、青、紫、緑などの色も存在します。高い輝きと分散性を持つため、無色のジルコンは宝飾品においてダイヤモンドの代替品として用いられることもあります。
Unusual Cloud in Diamond
A diamond with a previously unseen clarity characteristic is seen in GIA’s Carlsbad lab.


Charles “Chuck” Fryer(チャールズ「チャック」フライヤー) (1928年-2003年)
World-renowned gem identification expert who guided GIA's lab services to the forefront of gemological research.
GIAの科学者が世界でも希少なダイヤモンドを評価
Fall 2023 G&G Publication Information
This document provides the publication information for Gems & Gemology
Summer 2019 G&G Publication Information
This document provides the publication information for Gems & Gemology
Winter 2017 G&G Publication Information
This document provides the publication information for Gems & Gemology

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