Observations of Oval-, Pear-, and Marquise-Shaped Diamonds: Implications for Fancy Cut Grading
Presents findings from observations of oval-, pear-, and marquise-shaped diamonds, laying the groundwork for a fancy cut grading system.
Classification of Gem Materials Using Machine Learning
Explores the application of several machine learning models to complement traditional gem classification approaches.
Amethyst from Newfoundland, Canada: Geology, Internal Features, and Fluid Inclusion Microthermometry
Characterizes gem-quality amethyst from the La Manche deposit in the Avalon Zone of Newfoundland, Canada.
Generative Artificial Intelligence as a Tool for Jewelry Design
Evaluates the use of generative AI programs in jewelry design and addresses the related ethical, legal, and regulatory challenges.
The Extraordinary Backstory of Natural Diamonds: A Diamond Is (and Has Been) Forever
Examines new developments in the story of diamond formation and their extraction from the earth.
Gems & Gemology at Ninety: A Look to the Future
An overview of the Fall 2024 Gems & Gemology content.
Splendors from the Deep: Historic Treasures from a Spanish Shipwreck
An in-depth look at jewelry recently recovered from a 1715 Spanish shipwreck.
“Cotton Pearl” Imitations
An in-depth look at a new pearl simulant gaining popularity in the fashion jewelry market.
Two Imitation Melo Pearls
GIA’s Hong Kong and Bangkok laboratories report on imitation pearls with a striking resemblance to natural Melo pearls.
GIA Launches Newly Redesigned Consumer Website
Everything retailers and their customers need to know about diamonds just got easier to find and understand with GIA’s redesigned consumer-facing website dedicated to the 4Cs of Diamond Quality – Clarity, Cut, Color and Carat Weight – and to serve as the go-to source for gemstone information.
GIA Cultured Pearl Reports Include Traceability Information
Technology developed by Hong Kong-based Fukui Shell Nucleus Factory creates opportunities for tracing cultured pearls through the supply chain.
Quarterly Crystal: Spessartine in California Quartz
A smoky brown quartz crystal from Ramona, California, plays host to a 3.3 mm reddish orange spessartine.
G&G Facebook Group Surpasses 40,000 Members
Gems & Gemology’s growing community of gem enthusiasts features content from G&G contributors, GIA researchers, and other group members.
Natural-Looking Inclusions in a Ramaura Synthetic Ruby
Milky clouds and flux inclusions in a synthetic ruby create a challenge for identification.
International Jewelry Tokyo 2024
A look at Japan’s largest jewelry trade show, International Jewelry Tokyo, held in January 2024.
Unique Fingerprint in Montana Sapphire
A group of fingerprint and crystal inclusions form the shape of a bird in a Montana sapphire.
Unusually Large Flux-Grown Synthetic Sapphire
An abnormally large flux-grown synthetic sapphire rough crystal is examined in a lab in India.
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