Peridot from the Central Highlands of Vietnam: Properties, Origin, and Formation
Analyzes the gemological and geochemical characteristics of peridot from the Gia Lai province alongside specimens from other localities to gain insight into its formation.
Reversible Color Modification of Blue Zircon by Long-Wave Ultraviolet Radiation
Determines whether blue zircon, inadvertently altered to brown by exposure to long-wave UV radiation, can be restored to its original color through the use of incandescent light.
Bead-Cultured and Non-Bead-Cultured Pearls from Lombok, Indonesia
Documents the retrieval and testing of P. maxima cultured pearls from a Lombok hatchery.
Sapphires from the Sutara Placer in the Russian Far East
Studies the formation and chemical composition of the largely unexamined alluvial sapphires from Russia’s Jewish Autonomous District.
A New Deposit of Gem-Quality Grandidierite in Madagascar
Reviews the properties of exceptionally pure grandidierite from a new source.
Observations on CVD-Grown Synthetic Diamonds: A Review
Explores statistical data and defining characteristics of gem-quality CVD synthetic diamonds examined by GIA since 2003.
Iridescent Inclusion in Tanzanite
A tanzanite displayed crystallographically aligned, vividly iridescent colors resulting from fine separations along the stone’s cleavage planes.
Unusual Purple Inclusion in Emerald
Microscopic examination of an emerald revealed a purple banded inclusion with the appearance and optic character of fluorite.
Screening of HPHT Synthetic Melee With Natural Diamonds
A screening service allows the lab to screen for synthetic material in diamond melee parcels.
Quarterly Crystal: Quartz with Axinite
The first visual record of axinite inclusions in quartz published in the gemological literature.
Update on Colored Gemstone Mining in Tanzania
Reports on an expedition to many known and new Tanzanian gem localities.
Etch Marks, Negative Crystals, and Etch Tubes in Spinel from Madagascar
A spinel from Madagascar, mixed in with a parcel of blue sapphire, exhibited an array of internal features.
Trapiche Rhodochrosite
Reports on exceptionally rare trapiche-patterned rhodochrosite from the famed Capillitas mine in Argentina.
Non-Nacreous Purple and White Pearls Reportedly from Spondylus Species
Examination of pearls with a dominant purple hue, reportedly from the Spondylus calcifer mollusk.
Preliminary Study on Rubies Reportedly from Pokot, Kenya
Reports on the internal features and spectroscopic and trace-element analysis of rubies reportedly from Pokot, Kenya.
“Punsiri”-type FTIR Spectral Features in Natural Yellow Sapphires
Testing of natural-color yellow sapphires from Australia and Thailand with the FTIR features of “Punsiri” heat-treated material.
Purple Pyrope-Almandine Garnet From Mozambique
Analysis of attractive purple garnets from a new deposit in central Mozambique.
Aquamarine from a New Primary Deposit in Mexico
Examination of aquamarine samples from a new primary deposit in San Luis Potosí, northern Mexico.
Large Aqueous Primary Fluid Inclusion in Amethyst
A strikingly large primary fluid inclusion with a gas bubble was seen in a Moroccan amethyst.
Charting the Increasing Availability and Quality of CVD Synthetic Diamonds
An overview of the Fall 2016 Gems & Gemology content.
