Large Colorless HPHT Synthetic Gem Diamonds from China (英语)
A report on the HPHT growth of large, gem-quality colorless synthetic diamonds in China.
Variscite from Central Tajikistan: Preliminary Results
A look at the gemological properties and chemical composition of this light blue to light green to green gem material, which is suitable for cabochon cutting.
Diamond Inclusion with Radiation Halo
A diamond’s inclusion, with a radiation stain shaped like a halo, is found to be monazite.
“Star of David” Spinel Twin Crystal with Multiphase Inclusions from Mogok
A rare spinel, featuring a Star of David pattern and multiphase inclusions, is examined in Bangkok.
A Fantastic Display of Phase Changes in a Sapphire’s Fluid Inclusion
Phase changes illustrate the temperature and pressure conditions in the fluid inclusion system of a Sri Lankan sapphire.
Hydrophane Opal Treatment
An opal rough is immersed in water and treated with oil and Opticon to observe effects on transparency and play-of-color.
Red Cordierite from Madagascar (英语)
The gemological properties of the first documented occurrence of red cordierite, from Madagascar, are examined.
Emerald/Emerald Doublet
An unusual doublet consisting of two sections of natural emerald is examined the Tokyo lab.
Jewelry Television in Tucson
Book Review: Wartski: The First Hundred and Fifty Years
Review of Wartski: The First Hundred and Fifty Years, by Geoffrey Munn.
Book Review: Cartier Royal High Jewelry and Precious Objects
Review of Cartier Royal High Jewelry and Precious Objects, by François Chaille.
Book Review: Collector’s Guide to the Amphibole Group
Review of Collector’s Guide to the Amphibole Group, by Robert J. Lauf.
Spring 2016 G&G Publication Information
This document provides the publication information for Gems & Gemology
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