Potentate Mining expands its mining operation and hosts the first Montana sapphire tender in Bangkok.

The first documented case of corundum with irreversible photochromism encountered at GIA.

Devitrified glass inclusions resembling pom-poms or sea urchins are observed in a clarity-enhanced ruby.

A look at the most popular phenomenal gems exhibited at the 2025 Tucson gem shows.

Eye-visible kyanite inclusions give this 7.83 ct quartz its light blue color.

A remarkable skull carved from quartz crystals mined in Arkansas is submitted to the Carlsbad laboratory.

The Bangkok laboratory studies 35 loose non-nacreous pearls from a wide range of marine mollusk species.

A 6.79 ct orange pearl displays a fascinating spiral pattern.

A highly saturated purplish pink to red pezzottaite from a new deposit in Madagascar is encountered in Tucson and tested by GIA researchers.

An exhibitor at the 22nd Street show offers an unusual type of obsidian from Armenia.

Examination of a gigantic South Sea bead cultured pearl reveals an intriguing internal structure.

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

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

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.