Tucson: A Showcase of Colored Gemstone Innovation
An overview of the Spring 2016 Gems & Gemology content.
Identification of “Pistachio” Colored Pearls Treated by Ballerina Pearl Co.
A report on the color treatment process for these intensely greenish yellow to yellowish green cultured pearls and the techniques for identifying them.
Chrysoberyl from the New England Placer Deposits, New South Wales, Australia
Examines a collection of chrysoberyl samples from these sapphire placer deposits to determine their distinct mineralogical and chemical properties.
Gem-Quality Serpentine from Val Malenco, Central Alps, Italy
A detailed characterization of serpentine from this mountain locality, focusing on its use as a gem material.
An Introduction to Photoluminescence Spectroscopy for Diamond and Its Applications in Gemology
Presents the underlying physics and methodology of this analytical technique, which has become an essential tool in identifying treated and synthetic diamonds.
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.
Update on the Scorpion Tsavorite Mine
A look at the resumed operations and new production of Kenya’s Scorpion tsavorite mine.
Paula Crevoshay’s American Collection, Plus Jewelry with Nontraditional Gemstones
Lesser-known gem materials are seen in pieces alongside a collection created as an artistic inheritance for future generations of jewelry fans.
Large Colorless HPHT Synthetic Gem Diamonds from China
A report on the HPHT growth of large, gem-quality colorless synthetic diamonds in China.
Quarterly Crystal: Quartz and Lazulite
Lazulite crystals grow on and within a quartz specimen from Yukon Territory, Canada.
Ring with a CVD Synthetic Melee Diamond
A round-cut specimen set in a ring is the first mounted CVD synthetic melee diamond identified by GIA.
Largest Blue HPHT Synthetic Diamond
Analysis of a 5.03 ct HPHT-grown blue synthetic diamond, the largest ever examined by GIA.
Analysis of Yellow Diamond Melee for Color Treatment and Synthetics
A parcel revealed to contain natural, treated, and synthetic diamonds reinforces the importance of identification.
Emerald/Emerald Doublet
An unusual doublet consisting of two sections of natural emerald is examined the Tokyo lab.
“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.
Red Cordierite from Madagascar
The gemological properties of the first documented occurrence of red cordierite, from Madagascar, are examined.
Imperial Flame Topaz Sculpture
An Imperial topaz rough crystal is carved into a stunning freeform gem.
