GIA participates in two sustainability panels during the 2023 JCK Las Vegas show.

A look at a unique matching set of emerald and brown matrix cabochons from the Muzo mine in Colombia.

This article describes a new manufactured gem material marketed under the trade name

“Pearls”; “Terra Spinel Terra Firma”; “Colour of Paradise: The Emerald”; “Twentieth-Century Jewellery: From Art Nouveau to Contemporary”; “Jewellery from the Orient: Treasures from the Bir”

Inclusions with unusual formation are found in a treated Fancy Vivid yellow diamond.

The decay of the transient 2800 cm^–1 absorption peak in a Fancy gray diamond is observed.

Linear strain patterns are found in an HPHT synthetic diamond.

Curved linear inclusions, unusual in corundum, are found in sapphire acquired in Vietnam.

A rare inclusion scene is found in a garnet crystal from Namibia.