Trapiche Gems
The unusual six-rayed trapiche pattern, identified mainly with Muzo emeralds, has also been discovered in Mogok sapphires and Mong Hsu rubies.
Fluorescence Spectroscopy for Colored Pearl Treatment Screening
A nondestructive rapid screening technique uses fluorescence spectroscopy to identify treated colored pearls.
Russian Emerald
Untreated Russian emeralds, rarely seen in the market, demonstrate a range of color and degree of fineness.
Third Annual Gianmaria Buccellati Foundation Award Winner
A delicate, ethereal necklace depicting a diamond butterfly caught in a gem-studded spider’s web won the third annual Gianmaria Buccellati Foundation student jewelry design contest.
Large and Fine Demantoid from Russia
Unusually large top-quality faceted Russian demantoid garnets with the characteristic lovely green to yellowish green color excite attention at the Tucson GJX show.
Burmese Star Peridot
A rare Burmese star peridot cabochon is characterized by a soft four-rayed asterism and extremely fine acicular inclusions.
Ethical Gem Fair
A transparent supply chain and the education of artisanal miners were two of the many topics discussed at Tucson’s first Ethical Gem Fair.
Nephrite Jade from Multiple Sources
Green nephrite deposits are found at many locations around the globe, with British Columbia, Siberia, and northwestern China as the leading producers.
Sunstone Plagioclase Feldspar from Ethiopia
Advanced analytic techniques are critical for separating Ethiopian feldspar from Oregonian and copper-bearing feldspar with undetermined color origin.
Dyed Chalcedony Imitation of Chrysocolla-in-Chalcedony
Chrysocolla-in-chalcedony, also known as gem silica or blue chalcedony in Taiwan, is the most valuable chalcedony variety on the Taiwanese market.
Saltwater Bead Cultured Pearl with Laminated Nucleus
The Bangkok laboratory recently examined a pearl containing a laminated shell bead nucleus with mysterious properties.
Tucson 2020 Overview
In early February, despite the early phase of the COVID-19 outbreak, the Tucson shows were well attended and sales were brisk.
Carvings from Bali
Picturesque beaches and lush green jungles are not the only attractions that make Bali the most popular tourist destination in Indonesia.
Nigerian Gems and Jewelry
Mina Stones promotes Nigerian gems including rubellite and sapphire as well as reviving traditional skills and symbols in the creation of original jewelry.
Gem Carvings, Fantasy Cuts, and Master Recutting
This year at the AGTA show, the number of booths selling skillfully carved, fantasy cut, or expertly recut items was noticeably higher than in past years.
Spring 2020 G&G Publication Information
This document provides the publication information for Gems & Gemology
DNA Barcoding and Next-Generation Sequencing (NGS) of Freshwater Pearls
Freshwater pearls are the subject of GIA’s latest research involving the DNA barcoding and next-generation sequencing of biogenic materials.
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