Presents a group of corundum standards developed by GIA to improve the accuracy and efficiency of its laser ablation–inductively coupled plasma–mass spectrometry (LA-ICP-MS) instruments.

Explores an exceptional family of diamonds, referred to as “CLIPPIR” (Cullinan-like, Large, Inclusion-Poor, Pure, Irregular, and Resorbed), that formed in a superdeep environment.

An exhibit at the 2017 AGTA Tucson Gem Fair celebrates the work of Campbell Bridges.

Beads believed to be synthetic quartz are discovered to be glass with a surprising set of inclusions.

Opal purportedly from a new deposit is found to be dyed.

Coating on a beryl demonstrates the importance of thorough examination of jewelry and gem materials.

A deposit in North Carolina yields potassium feldspar with a phenomenon similar to Australian rainbow lattice sunstone.

A light green specimen, submitted as a rough diamond, is actually a synthetic moissanite.

A Peruvian source yields a new azurite-malachite mixture.

For the first time, the Carlsbad and New York labs see natural sapphire seeds with synthetic ruby overgrowth.

A unique inclusion in red spinel is indicative of a Burmese origin.

Examination of a chatoyant alexandrite cabochon.

Compares the image quality provided by real-time microradiographic imaging (RTX) units fitted with two different detectors: an image intensifier (II) and a flat panel detector (FPD).

A look at the artistic heritage of the Drehers, an influential family of gem carvers in Idar-Oberstein, Germany.

Characterizes the akoya cultured pearls produced on the eastern shoreline of Australia using native Pinctada imbricate fucata mollusks.

Joanna Hardy著Ruby（ルビー）のレビュー。

Provides a visual guide to the internal features of natural, synthetic, and treated rubies.

Compares the image quality provided by real-time microradiographic imaging (RTX) units fitted with two different detectors: an image intensifier (II) and a flat panel detector (FPD).