New Nigerian Green Beryl Find
Vendors in Tucson exhibited Nigerian green beryl with concentrated color zones.
CVD-Grown Diamond with an Unusual Blue Band
An HPHT-treated CVD-grown diamond displaying a blue growth band is examined in the Mumbai laboratory.
Copper in Indonesian Chalcedony
Examination of two chalcedony cabochons from a new source in Indonesia reveals an abundance of native copper.
Aquamarine with Fluorite Inclusions
A large aquamarine crystal from Pakistan displays multiple eye-visible fluorite inclusions.
Checkered Pattern on Diamond
The Mumbai laboratory examines a modified pear portrait-cut natural diamond.
Emeralds in Catherine de’ Medici’s Pendant: An Unexpected Geographic Origin
Archival research and gemological characterization reveal the geographic origin of two emeralds set in a pendant linked to Catherine de’ Medici, Queen of France from 1547 to 1559.
The 3309 cm^–1^ Series in Sapphire and Ruby: A Focus on FTIR Peak Position Variation
Investigates the correlations between peak positions in the 3309 cm–1 series with trace element concentrations for ruby, metamorphic and basalt-related blue sapphire, and laboratory-grown sapphire.
Heated Corundum, the Remarkable Winston Red, and an Extraordinary Renaissance Jewel
An overview of the Spring 2025 Gems & Gemology content.
“Enhydro” Amethyst from Morocco
A rare find of Moroccan amethyst with eye-visible fluid inclusions is spotted at the Pueblo show.
In Memoriam: Henry A. Hänni
The life of renowned Swiss gemologist and educator Henry A. Hänni is remembered.
Surfite: A Surfboard Manufacturing Byproduct
Crystal inclusions in a natural diamond resemble a unique scene.
A Study of the Winston Red: The Smithsonian’s New Fancy Red Diamond
Presents the first scientific and historical study conducted on the 2.33 ct Winston Red, the fifth-largest known Fancy red diamond in existence.
Rare Gem-Quality Viitaniemiite
“Rime Ice” on Trees in Jeremejevite
Crystal inclusions in a natural diamond resemble a unique scene.
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