Classification of Gem Materials Using Machine Learning
Explores the application of several machine learning models to complement traditional gem classification approaches.
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.
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.
Splendors from the Deep: Historic Treasures from a Spanish Shipwreck
An in-depth look at jewelry recently recovered from a 1715 Spanish shipwreck.
Gems & Gemology at Ninety: A Look to the Future
An overview of the Fall 2024 Gems & Gemology content.
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.
“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.
Fall 2024 G&G Publication Information
This document provides the publication information for Gems & Gemology
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.
Fashioned Queen Conch Shell Bead
A Queen conch shell bead is submitted for pearl identification to the Mumbai laboratory.
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.
Natural Pearl Necklace from Baja California Sur, Mexico
The Carlsbad laboratory reports on a recently submitted necklace containing 63 pearls of various colors, shapes, sizes, and mollusk species, reportedly from Mexico.
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.