Gemstone Guidebook Project
A project coordinated by GIA and the NGO Pact provides a valuable educational tool to women miners in Tanzania.
Merelaniite Inclusions in Tanzanite
recently identified mineral is found, in whisker-like form, in a gem-quality tanzanite host.
Natural Blue and Black Diamonds, a Byzantine Garnet Intaglio, Yogo Sapphires, and “Kasumiga Pearls”
An overview of the Summer 2018 Gems & Gemology content.
合成ダイヤモンドの特徴 (英語)
Presents a visual guide to the growth processes and major gemological spectroscopic features of synthetic diamonds.
An Early Byzantine Engraved Almandine from the Garibpet Deposit, Telangana State, India: Evidence for Garnet Trade Along the Ancient Maritime Silk Road
Analyzes the chemical composition and inclusion characteristics of this ancient artifact.
Cultured Pearls from Lake Kasumigaura: Production and Gemological Characteristics
Examines Japanese “Kasumiga” freshwater cultured pearls, which grow in a variety of colors.
モンタナ州のYogo（ヨゴ）渓谷から産出されたサファイアの宝石学的な特徴 (英語)
A look at the mining and distinguishing characteristics of this naturally vibrant blue sapphire.
Black Diamonds from Marange (Zimbabwe): A Result of Natural Irradiation and Graphite Inclusions
Characterizes a suite of 40 natural brown to black diamonds from this deposit so that they can be distinguished from suspected treated black diamonds.
Natural-Color Blue, Gray, and Violet Diamonds: Allure of the Deep
Summarizes data collected on more than 15,000 natural blue/gray/violet diamonds examined by GIA during the last decade and examines the mechanisms that produce this color range.
Natural-Color Blue, Gray, and Violet Diamonds: Allure of the Deep
Summarizes data collected on more than 15,000 natural blue/gray/violet diamonds examined by GIA during the last decade and examines the mechanisms that produce this color range.
Diamonds Help Solve the Enigma of Earth’s Deep Water
The first installment of G&G’s newest section explores how natural diamonds shed light on the mystery of water found in Earth’s deep mantle.
Book Review: Women Jewellery Designers
Juliet Weir-de La Rochefoucauld著『Women Jewellery Designers（女性のジュエリーデザイナー）』のレビュー
Large Pinkish Orange CVD Synthetic Diamond
A combination of size, color, and clarity made this the most remarkable CVD synthetic diamond GIA has tested so far.
A Cat’s-Eye Rock Consisting of Jadeite and Amphibole
Raman spectroscopy reveals that a green bead, showing chatoyancy on one side, comprises jadeite and amphibole.
Large Faceted Afghanite
A report on the largest facet-grade afghanite seen in the GIA gem identification department.
A Horse-Shaped Inclusion in Pink Sapphire from Mozambique
Microscopic examination of a Mozambican pink sapphire reveals an inclusion with a surprising shape and composition.
Exhibition Review: Cartier: The Exhibition
A review of Cartier: The Exhibition at the National Gallery of Australia in Canberra.
A Repaired Diamond
A marquise-cut diamond is found to have been broken and reassembled with an unknown adhesive.
Book Review: Dreher Carvings: Gemstone Animals from Idar-Oberstein
Review of Dreher Carvings: Gemstone Animals from Idar-Oberstein by Wilhelm Lindemann, Will Larson, and Ekkehard Schneider.