Natural-Colour Blue, Grey and Violet Diamonds: Allure of the Deep
Summarises data collected on more than 15,000 natural blue/grey/violet diamonds examined by GIA during the last decade and examines the mechanisms that produce this colour range.
Akoya Cultured Pearl Farming in Eastern Australia
Characterises the akoya cultured pearls produced on the eastern shoreline of Australia using native Pinctada imbricata fucata molluscs.
The Very Deep Origin of the World’s Biggest Diamonds
Explores an exceptional family of diamonds, referred to as “CLIPPIR” (Cullinan-like, Large, Inclusion-Poor, Pure, Irregular and Resorbed), that formed in a super-deep environment.
Photoluminescence Spectra of Emeralds from Colombia, Afghanistan and Zambia
Compares PL spectroscopy data of 48 emerald samples from three countries to evaluate the usefulness of the technique in geographic origin determination.
Observations on HPHT-Grown Synthetic Diamonds: A Review
Summarises statistical data and distinctive features of several thousand gem-quality HPHT synthetic diamonds examined by GIA from 2007 through 2016.
Japanese Jadeite: History, Characteristics and Comparison with Other Sources
Examines the sources, colour, texture and chemical composition of jadeite from Japanese deposits.
Causes of Iridescence in Natural Quartz
Describes the occurrence of iridescence, and the role of differential etching, in quartz crystals from India’s Jalgaon District.
Largest Blue HPHT Synthetic Diamond
Analysis of a 5.03 ct HPHT-grown blue synthetic diamond, the largest ever examined by GIA.
An Introduction to Photoluminescence Spectroscopy for Diamond and Its Applications in Gemmology
Presents the underlying physics and methodology of this analytical technique, which has become an essential tool in identifying treated and synthetic diamonds.
Pyrope Garnet and Montana Sapphires Highlight Winter 2015 G&G
G&G Brief presents an overview of the content of the Winter 2015 issue of Gems & Gemology.