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.

The Chinese jewelry industry bounces back quickly due to the country’s incredible digital ecosystem and the uptick in sales at international luxury brands.

A centuries-old diamond featuring a hand-drilled hole inspires an investigation of the briolette cutting style and the history of drilling diamonds.

An overview of the Spring 2021 Gems & Gemology content.

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

CARLSBAD, Calif. – May 17, 2021 – GIA is seeing an increase in the number of laboratory-grown diamonds submitted for update or verification services with counterfeit inscriptions referencing GIA natural diamond reports.

CARLSBAD, Calif. – April 20, 2021 – Inspiration is a driving force in all of our lives, and it was the deciding factor in the difficult decision to select just two recipients for the Beyoncé Knowles-Carter x Lorraine Schwartz GIA Scholarship for full tuition to earn GIA’s Graduate Gemologist diploma through distance education.

CARLSBAD, Calif. – April 14, 2021 – Citing recognition of GIA for gemological report services and education, a Belgian court unequivocally ordered AIG Belgium, operating as American International Gemological Laboratories and Antwerp International Gemological Laboratories, to immediately cease using ‘AIG’ alone or in conjunction with other marks, or face significant penalty payments.

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.

Proposes a formation model for sapphire from the main deposits in southern Vietnam based on the chemical composition of their mineral inclusions.

Presents a combination of observational and spectroscopic means to separate the three main geographic localities for blue amber, which shows very strong blue fluorescence under sunlight or D65 illumination.

Studies the effects of low-temperature heat treatment on inclusions in this gem material, as well as the use of FTIR spectroscopy to detect the treatment.