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.

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

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

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.

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

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

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

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

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.

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.

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.

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

Crystal inclusions in a natural diamond resemble a unique scene.