The age of something is fundamental. Humans, animals, wine, cars, and antiques are viewed and understood in the context of their age.

Advanced testing helps to identify the largest gahnospinel seen at any GIA laboratory.

A unique doublet displaying a yellowish chatoyant sheen is examined by the Tokyo lab.

Bangles resembling nephrite and jadeite were not what they appeared to be.

The Carlsbad lab identifies a color-change Burmese sapphire with a unique chemistry profile.

Trapiche-like ruby from Kashmir shows a well-formed fixed six-rayed pattern.

Indonesian purple chalcedony containing interesting native copper inclusions is a first for the Carlsbad lab.

Spinel is often inclusion free but occasionally showcases unusual inclusions.

Reveals new details about this historical jewel and the results of its first gemological analysis.

Establishes a metamorphic origin for sapphire samples from these deposits, supported by their trace-element composition and inclusion characterization, including the age dating of zircon inclusions.

Shows how alexandrite’s color and color change are affected by cut and the orientation of table facets.

Documents a visit to the sapphire, opal, and emerald mining and trading areas of Ethiopia.

Investigates trace-element chemistry of freshwater natural pearls from North America and China with LA-ICP-MS and uses LDA to identify their origins.

Presents a simplified but comprehensive classification of gem tourmaline species based on quantitative measurement of six common major elements.