Attractive iridescence creates a beautiful “play-of-color” effect on dendritic healed fissures in a blue sapphire.

Two Australian rough diamonds demonstrate both pink and colorless sections in the same crystal.

In a delightful juxtaposition, a diamond-shaped cloud inclusion appears in the center of a 0.53 ct round brilliant diamond.

The Carlsbad laboratory recently examined an unusually large faceted hexagonite with iridescent cleavage cracks and needle-like structures.

A beautiful new gem and mineral museum in Tucson is home to the stunning Somewhere in the Rainbow collection.

An overview of how the gem and jewelry trade, from miners to manufacturers, and from designers to dealers, dealt with the many challenges posed by the pandemic.

Presents the internal characteristics of natural P. maxima pearls, obtained from real-time microradiography (RTX) and X-ray computed microtomography (µ-CT) analysis of 774 samples.

The author examined a 0.56 ct Fancy grayish bluish green diamond with prominent green radiation stains.

Abnormal fluorescence supports the likelihood that this amber bracelet had been “baked” to enhance its color.

The Carlsbad laboratory recently examined a Mexican opal containing a rare fluid inclusion with a freely moving gas bubble.

Oblique fiber-optic illumination of thin-film fluid inclusions in Brazilian aquamarine reveals a kaleidoscopic play of interference colors.

A graduate of GIA’s Hong Kong Jewelry Design program hopes her award-winning design will help raise environmental awareness.

Provides a visual guide to the internal features of natural, synthetic, and treated spinel, as well as inclusions of spinel in other gemstones.

A singly-terminated topaz from Pakistan hosts a prominent phlogopite crystal with strong dichroism and lamellar cleavage planes.

The Bangkok lab identified unexpected characteristics in a flux-grown synthetic sapphire.

Offers a systematic evaluation of rose cuts produced for various colored stones in the latter seventeenth century, based on the examination of rare artifacts that belonged to the archbishops and prince-electors of Trier and Cologne.

The GIA lab in Carlsbad recently had the opportunity to examine a truly “all-American” diamond.

Progress in creating laboratory-grown CVD diamonds allows for larger sizes, including the largest yet seen at the Carlsbad lab.