Provides criteria for detecting the resin filling of turquoise, an advanced treatment that reduces porosity and can dramatically improve appearance and stability.

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

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.

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

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

A rare chatoyant effect is produced within play-of-color patches in a natural opal.

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

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

Presents a method for accurately predicting the color of a gem material when viewed in any direction as long as the polarized spectra and the viewing angle relative to the c-axis are known.

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

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.

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

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

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

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

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

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

Two cabochons displaying white four-rayed “stars” are fashioned from one large natural diamond crystal.