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

A Peruvian source yields a new azurite-malachite mixture.

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.

Examination of a chatoyant alexandrite cabochon.

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

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

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

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

Microscopic observation and trace element analysis is performed on rubies from Longido.

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

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

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

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

Natural diamonds exhibit characteristics normally seen in synthetic material.

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

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.

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

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).

ツーソンで行われたGIA同窓会パーティーに出席するために並んでいた男女が、永遠に人生を変えるチャンスに巡り合いました。