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。

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

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

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

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.

Topaz is an important gemstone that occurs in various colors.

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

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

Reviews the mining history, market impact, and properties of ruby from northern Mozambique near Montepuez, now the world’s most productive source.

Shows how the color of Madagascar sapphire is lightened with heating to relatively low temperatures below 1350°C.

Two pearls presented a unique challenge, as testing at three different gemological laboratories could not conclusively identify them as natural or cultured, determine a freshwater or saltwater growth environment, or specify the producing mollusk.

Examines the basic characteristics of kimberlites and their relationship with diamonds.

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

Characterizes black nephrite from a deposit in the Guangxi region that appears to be part of a large-scale jade formation belt in southern China.

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

Twelve pink sapphires undergo low-temperature heat treatment and reveal a correlation with the 3232 cm-1 FTIR peak.