Euhedral Aquamarine Crystals in Quartz
Microscopic examination of quartz reveals well-formed blue hexagonal prismatic crystals exhibiting moderate pleochroism.
New Chrysoprase Production from Western Australia
GIA’s Bangkok laboratory reports on a study of rough and cut chrysoprase from a newly discovered deposit in Western Australia.
A Fashioned Dyed Shell Imitation Pearl
An imitation is identified in a parcel of non-nacreous pearls submitted to the Mumbai laboratory.
Cinnabar in Quartz
Striking red cinnabar inclusions are observed in a quartz specimen from China.
Uniquely Patterned Clouds in Sri Lankan Sapphire
Particle clouds with an interlocking triangular pattern are revealed in a blue sapphire from Sri Lanka.
Your Purchase Feeds: Vaibhav Global Limited’s Social-Impact Approach
Global retailer VGL offers ethically sourced jewelry while partnering with hunger-relief organizations to provide meals for children.
Chocolate Opal
A common opal from Ethiopia examined in the New York laboratory bears a striking resemblance to a bar of chocolate.
A Classification Scheme of Natural Radiation Stain Morphology and Texture on Diamond
Offers a classification of radiation stain morphology and texture using photomicrography to supplement known characteristics of naturally irradiated diamonds.
Atypical Bead Cultured Pearls Identified in a Natural Pearl Necklace
The Mumbai laboratory encounters numerous small atypical bead cultured pearls drilled and strung alongside natural pearls.
Mystery Bubble in Spinel
An inclusion feature with a mobile bubble is examined in a spinel reportedly from Myanmar.
CVD Synthetic Fashioned to Imitate a Rough Natural Diamond
Reports on a CVD-grown synthetic diamond fashioned in the approximate shape of an octahedron.
In Memoriam: George R. Rossman
The gemological community mourns the loss of mineralogy professor George Rossman.
Evidence of Heat Treatment in Spinel
Examination of inclusions in a red spinel reveals signs of heat treatment.
An Unusual Filled Cultured Pearl
A light gray near-round pearl exhibits an opening plugged with a drilled seed pearl.
Diverse Range of Organic-Rich Cores in South Sea Non-Bead Cultured “Keshi” Pearls
Examines the organic-rich cores of non-bead cultured “keshi” pearls from Pinctada maxima mollusks to distinguish them from natural pearls of the same species despite their similar internal structures.
Quarterly Crystal: Spires on Moldavite
A rare specimen of moldavite tektite with unbroken spires from the Czech Republic is examined.
Transparent Staurolite
A rare transparent dark red-brown freeform step-cut staurolite is examined in the Carlsbad laboratory.
Records from a Luxurious Past: Gem Inventory of a Seventeenth-Century Armenian Merchant
Analyzes a 1688 probate inventory of Gregorio di Girach-Mirman’s extensive gemstone collection to highlight the global reach and influence of Armenian merchants in the early modern luxury trade.
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