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.
GIA Student Design Showcase
A GIA student from the New York campus receives recognition for a necklace design featuring diamonds, lavender jade, and akoya pearls.
Metallic See-Through Backing on Omphacite Jade
An unusual effect created by the backing on a jade carving is observed in the Carlsbad laboratory.
Heliodor and Aquamarine with Surface Etching
Hexagonal etch features are observed on the prismatic faces of heliodor and aquamarine crystals.
Large Natural Diamonds with Asteriated Cloud Inclusions
Two natural diamonds containing cloud inclusions that resemble stars are examined in the Carlsbad laboratory.
Square-Shaped Cloud in Diamond
A natural faceted diamond displays a prominent square-shaped cloud under the table.
New Emerald Production from the Curlew Mine, Western Australia
GIA’s Bangkok laboratory studies emeralds from the Curlew mine’s recently renewed production.
Laboratory-Grown Diamonds: An Update on Identification and Products Evaluated at GIA
Reviews the advancements and major trends in laboratory-grown diamonds observed by GIA since 2007.
Micro-Features of Tourmaline
Provides a visual guide to the internal features of tourmaline as well as tourmaline inclusions in other gem hosts.
Gemological and Trace Element Characteristics of Cassiterite from Yunling, China
Examines gem-quality cassiterite from southwest China and analyzes trace element chemistry to distinguish it from Bolivian cassiterite.
Gem-Quality Anorthoclase Feldspar from Southeast Vietnam
Characterizes an anorthoclase variety of alkali feldspar found in southeast Vietnam and evaluates its potential for commercial use.
Dance of Light and Color: Painted Labradorite
Artist Valentina Fetisova transforms labradorite cabochons into remarkable works of art.
Dance of Light and Color: Painted Labradorite
Artist Valentina Fetisova transforms labradorite cabochons into remarkable works of art.
Gems & Gemology at Ninety: Consistency and Change
An overview of the Summer 2024 Gems & Gemology content.
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