Texas Topaz, Slovak Opal, a Beryl Inclusions Chart, and More
An overview of the Winter 2023 Gems & Gemology content.
An Unusual Partially Non-Nacreous Pinctada radiata Natural Blister Pearl
A large Pinctada radiata natural blister pearl displays a unique reaction under long-wave ultraviolet light.
Seed Pearls in an Antique Indian-Style Headdress
GIA’s Mumbai laboratory analyzes seed pearls decorating an Indian-style headdress.
Tubular Feature in a Natural Pearl
Investigation of a tubular feature in a natural pearl reveals evidence of parasitic activity.
Exquisite Butterfly in Diamond
A crystal inclusion with a stress halo resembles a colorful butterfly in a 1.01 ct diamond.
Octahedral Gahnospinel Crystal in Sri Lankan Blue Sapphire
A rare octahedral gahnospinel crystal is observed in Sri Lankan sapphire.
Bohemian Garnets as Decorative Materials for Glass Vessels from the Late Sixteenth to Early Eighteenth Centuries
Examines a technique for setting cut garnets on glass objects, invented by Claudius vom Creutz of Nuremberg in the late sixteenth century.
Winter 2023 G&G Publication Information
This document provides the publication information for Gems & Gemology
Blue Amblygonite-Montebrasite from Rwanda
A report on a new blue variety of amblygonite-montebrasite from Rwanda.
FTIR Identification of Carbon Dioxide Fluids in Sapphire
FTIR spectroscopy shows that the existence of carbon dioxide gas bubbles in a negative crystal in sapphire is no longer proof of the absence of heat treatment.
Cricket Bat Diamond
A diamond shaped like a cricket bat is submitted to GIA’s Mumbai laboratory.
Unusual Large Nacreous Pen Pearls
A report on the identification of three large baroque pearls submitted to the Mumbai laboratory.
Rare Faceted Thomsonite
A colorless semitransparent thomsonite is examined in the Carlsbad laboratory.
Small Freshwater Bead Cultured Pearls
The Carlsbad laboratory reports on a strand of 78 light bluish gray pearls submitted for identification.
Quarterly Crystal: Hiddenite from Idaho
Sail-shaped etch features provide proof that a sample sold as aquamarine is actually a spodumene crystal.
37th International Gemmological Conference
A report from the 37th IGC, held in late October 2023 in Tokyo.
Fall 2023 Auction Highlights
Large blue and pink diamonds were among the top lots of the fall auction season, including the most expensive auction jewel of 2023.
G&G Contributors Awarded for Best Geoscience Research
Several G&G contributors are recognized for their work on the latest volume in the Reviews in Mineralogy & Geochemistry series.
Artisanal Diamond Mining: Addressing the Knowledge Gap
Diamonds for Peace conducts basic training on rough diamond grading for artisanal miners in Liberia.