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.

加利福尼亚州卡尔斯巴德 — 2021 年 5 月 17 日 — 越来越多仿冒 GIA 天然钻石报告刻字的实验室培育钻石提交至 GIA 鉴定所进行更新或验证。

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.

加利福尼亚州卡尔斯巴德— 2021 年 4月 14 日 — 比利时某法院引证认可 GIA 提供宝石证书服务和教育，明确命令以 American International Gemological Laboratories（美国国际宝石实验室）和 Antwerp International Gemological Laboratories（安特卫普国际宝石实验室）之名运营的比利时 AIG 立即停止单独使用“AIG”或与其他标志连用，否则将面临巨额罚款。

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.

Diamond ages offer insight into continent evolution spanning billions of years.

Located about 60 miles east of San Diego, a new emerald deposit has been discovered in the Julian Mining District.