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.
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.
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.
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.
International Jewellery Kobe 2024
An overview of one of the premier international jewelry trade shows in western Japan.
Pearls Marketed as “Venezuelan Pearls”
GIA’s Mumbai laboratory reports on a study of 988 reportedly “Venezuelan pearls.”
Unusual Hematite Lattice Pattern in Plagioclase Feldspar
Elongated hematite platelets form a lattice pattern in a sunstone cabochon.
Mask Inhabiting a Natural Diamond
The mirror image of a feather inclusion in a natural diamond resembles a theater mask.
Quarterly Crystal: Magnesioaxinite
A color-change magnesioaxinite crystal specimen from Tanzania contains an interesting inclusion scene.
Anatase in Brazilian Quartz
Anatase crystals create stunning blue interference colors in a Brazilian quartz host.
Kaleidoscope of Butterflies and Tiny Fish in Diamonds
Feather inclusions observed in two natural diamonds evoke scenes in nature.
Diopside and Danburite in Rare Orange Sodalite
Examination of a rare orange sodalite reveals diopside and danburite inclusions, as well as short-lived tenebrescence.
“Frozen River” on the Surface of an Atrina Pearl
Layered aragonite crystals create a translucent frosted surface appearance on a nacreous pearl from an Atrina mollusk.
Metallic Core in a Natural Freshwater Pearl
Examination of a natural freshwater pearl reveals a metallic core and suggests environmental contamination during the pearl’s formation.