Investigation in the Carlsbad laboratory reveals a pearl submission is not mabe as initially believed.

A black opal cabochon set in a ring displays vivid orange play-of-color.

Bright green and nearly transparent jade from Guatemala, similar to jade from Myanmar, was available in Tucson.

A partially filled fissure in an emerald exhibits patterns resembling natural foliage.

A cluster of cloud inclusions in diamond forms a petal-like structure resembling a rose.

A report on a submission of 26 yellow HPHT-grown diamonds from the Hong Kong laboratory.

A report from the New York laboratory on colorless and near-colorless CVD gem diamonds produced by the Texas-based company Plasmability.

An omphacite inclusion surrounded by fractures in an orangy yellow diamond takes the shape of a hummingbird.

Vendors in Tucson exhibited Nigerian green beryl with concentrated color zones.

An HPHT-treated CVD-grown diamond displaying a blue growth band is examined in the Mumbai laboratory.

Examination of two chalcedony cabochons from a new source in Indonesia reveals an abundance of native copper.

A summary of the findings at the 2025 Tucson gem shows.

The Mumbai laboratory examines a modified pear portrait-cut natural diamond.

A large aquamarine crystal from Pakistan displays multiple eye-visible fluorite inclusions.

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.

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.

Presents the first scientific and historical study conducted on the 2.33 ct Winston Red, the fifth-largest known Fancy red diamond in existence.

An overview of the Spring 2025 Gems & Gemology content.