Gemstone Guidebook Project
A project coordinated by GIA and the NGO Pact provides a valuable educational tool to women miners in Tanzania.
Natural Blue and Black Diamonds, a Byzantine Garnet Intaglio, Yogo Sapphires, and “Kasumiga Pearls”
An overview of the Summer 2018 Gems & Gemology content.
合成钻石的特征 (英语)
Presents a visual guide to the growth processes and major gemological spectroscopic features of synthetic diamonds.
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.
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.
蒙大纳州约戈峡谷蓝宝石的宝石学特征 (英语)
A look at the mining and distinguishing characteristics of this naturally vibrant blue sapphire.
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.
Summer 2018 G&G: Diamonds Across the Spectrum, Byzantine Garnet, and Sapphires from Yogo Gulch
A summary of the Summer 2018 issue of Gems & Gemology.
研究人员发现蓝色钻石的独特起源
纽约州，纽约市 — 2018 年 8 月 1 日 — 著名国际科学期刊《自然》登载的封面文章中提及的新研究显示，作为最罕见的彩色钻石之一，蓝色钻石是在极端深度下形成的（约比大部分钻石深四倍）；并惊奇地发现其颜色可能由硼元素所致，这些硼元素蕴含于远古海洋层中，因构造板块运动被带到了地幔深处。
蓝色钻石来自哪里？
Alumni Members: Stand Out by Taking Advantage of Opportunities, Events
Introduce yourself to industry leaders who inspire, share their knowledge, act as mentors and provide service to the industry they love.
GIA Resources Give Retailers an Edge in Customer Education
The GIA Retailer Support Program tools help guide consumers through the jewelry buying process so they can make informed and confident purchases.
GIA 奖学金帮助设计师建立专业技术能力、创造力
JDT program gives designer the skills and techniques – and freedom – to create the designs that move past the trends.
Robust Demand Brings Increased Rough Diamond Sales
Demand for diamonds has been good so far this year. Rough sales have increased and large diamonds are being mined. Plus: Online sales tax changes.
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