Crystal inclusions in a natural diamond resemble a unique scene.

Pyrite particles included in a “black grass” red agate are unique to material from Liangshan, China, and serve as indicators of origin.

Amphibole, a collectors’ stone in its own right, is identified as an inclusion in a ruby from Mozambique.

Methodical gemological testing in the New York laboratory unmasks a cleverly-dyed beryl imitating an emerald.

Thorough testing by Carlsbad gemologists reveals an artificial glass imitation posing as moldavite.

Agate appears as an interesting inclusion in a pair of faceted quartzes.

Meticulous testing of a bangle submitted to a Taiwan gemology lab proves it to be a composite of red calcareous coral and epoxy.

Eye-popping specimens are on display at the revitalized and newly-reopened Mignone Halls of Gems and Minerals at the American Museum of Natural History in New York City.

A partially polished rock fragment exhibits a very realistic eye pattern.

Filler patterns resembling a labyrinth are observed in emerald fractures.

A London-based company aims to responsibly source emeralds from Swat Valley, Pakistan, while supporting women in business and education.

A reported untreated ruby from Mozambique shows evidence of heat treatment.

The Tokyo laboratory reports on a bicolor copper-bearing tourmaline with bodycolor ranging from bluish green to dark yellowish green.

The Carlsbad laboratory reports on a Fancy grayish green diamond with radiation stains resembling blades of grass.

Testing a 10 ct CVD laboratory-grown diamond reveals evidence of HPHT treatment.

Four blue rough gemstones are submitted as natural sapphire, but the Carlsbad laboratory determines only one is natural.

The Bangkok laboratory reports an increasing number of RFID devices embedded in pearls, including two recently submitted South Sea bead cultured pearl necklaces.