U.S. consumer confidence has kept the economy from sliding into a possible recession.

大胆な大小のフラッシュ効果を示したり、極小の煌めきを素早く放つ軽やかなダンス。

隨著新的寶石處理方式及實驗室培育寶石流入市場，GIA 服務和儀器的重要性和影響力也越來越大。

GIA’s services and instruments have grown in importance and impact as new gem treatments and laboratory-grown gems enter the market.

New Mineral Named for Famed Gemologist John Koivula

CARLSBAD, Calif. – Sept. 5, 2019 – GIA released a software upgrade on Sept. 4 for the industry-leading GIA iD100® gem testing device, giving the instrument the ability to distinguish natural pink diamonds from laboratory-grown (HPHT and CVD) diamonds and diamond simulants.

CARLSBAD, Calif. – Aug. 19, 2019 – Aspiring gem and jewelry professionals in Shenzhen, China will now have direct access to GIA education programs through Peking University Resource College.

CARLSBAD, Calif. – Aug. 19, 2019 – Aspiring gem and jewelry professionals in Shenzhen, China will now have direct access to GIA education programs through Peking University Resource College.

米国務省は、宝飾業界に書類受け渡し記録の管理が十分に行われていないと報告します。

Conclusively identifying the origin of a “hollow” pearl filled with foreign materials proves challenging.

The interior structures of pearls are always of interest, as they are never revealed until the analysis begins.

The Bangkok laboratory recently identified a pyrope-almandine garnet in a sapphire host.

Fluorite inclusions in emeralds from various localities have been reported extensively in the literature.

Although opals generally contain water in their structure, fluid inclusions large enough to be resolved with the microscope are rare; those that can be seen with the unaided eye are exceedingly rare.

The appearance of curved banding under short-wave UV easily identifies flame-fusion synthetic sapphire.

A 7.54 ct natural emerald containing a 3D helical inclusion is examined by the Tokyo laboratory.

Topaz is an important gemstone that occurs in various colors.

A study of these pearls to characterize their distinctive flame structure and examine the possibility of rotation during their formation or growth.

Provides a visual guide to the internal features of natural, treated, synthetic, and imitation opal.