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.

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.

The annual Tucson Gem and Mineral Show has been a reliable source for the niche and the unusual, as seen with the rhodium-plated iron meteorites acquired by author BL at the 22nd Street Show in February 2020.

A holiday snowflake scene in a treated Mong Hsu ruby surprises and delights a gemologist in the Bangkok lab.

A creative imitation using fused bluish green glass with copper platelets poses as Paraíba tourmaline.

A parcel of small rubies was received for identification at the S Gemmological Institute (SGI) gem lab in Yangon, Myanmar.

An overview of the Winter 2020 Gems & Gemology content.

本研究では、バンコクのラボラトリーが、現地の真珠養殖場から直接採取された5つの低品質の有核養殖真珠を検査し、加工の前後の特徴を記録しました。