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.

A clear example of calcite twinning is found in a ruby from the Mogok Stone Tract.

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

Unusual inclusions are found in an opal from Ethiopia’s Wollo Province.

A quartz crystal from Namibia, hosting of spherulitic to circular masses of shattuckite, is examined.

A Peruvian source yields a new azurite-malachite mixture.

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

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

Natural diamonds exhibit characteristics normally seen in synthetic material.

A pearl, thought to be natural, is revealed to be a bead-cultured specimen with a pre-drilled nucleus.

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

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

Examination of a chatoyant alexandrite cabochon.

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

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

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.

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

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.

An overview of the Spring 2018 Gems & Gemology content.