这次交易对在线钻石零售商来说可能意味着重大改变。 附：Rio Tinto（力拓）提供创纪录的彩色钻石品质。

了解一些宝石的结构、内含物和性质如何通过与光线的互动来形成非凡的视觉效果。

保存在 GIA 图书馆的 200 多本具有重大历史意义的书籍已经进行了数字化处理，可供读者免费查阅。

A screening service allows the lab to screen for synthetic material in diamond melee parcels.

Microscopic examination of an emerald revealed a purple banded inclusion with the appearance and optic character of fluorite.

A spinel from Madagascar, mixed in with a parcel of blue sapphire, exhibited an array of internal features.

A tanzanite displayed crystallographically aligned, vividly iridescent colors resulting from fine separations along the stone’s cleavage planes.

This violet-colored fluorite crystal was free to move in its octahedral void, as seen in four different positions. Photomicrographs by Nathan Renfro; field of view 7.18 mm.

The first visual record of axinite inclusions in quartz published in the gemological literature.

Reviews the properties of exceptionally pure grandidierite from a new source.

Documents the retrieval and testing of P. maxima cultured pearls from a Lombok hatchery.

Examination of aquamarine samples from a new primary deposit in San Luis Potosí, northern Mexico.

A strikingly large primary fluid inclusion with a gas bubble was seen in a Moroccan amethyst.

Reports on the internal features and spectroscopic and trace-element analysis of rubies reportedly from Pokot, Kenya.

Testing of natural-color yellow sapphires from Australia and Thailand with the FTIR features of “Punsiri” heat-treated material.

Analysis of attractive purple garnets from a new deposit in central Mozambique.

Reports on exceptionally rare trapiche-patterned rhodochrosite from the famed Capillitas mine in Argentina.

Reports on an expedition to many known and new Tanzanian gem localities.

Examination of pearls with a dominant purple hue, reportedly from the Spondylus calcifer mollusk.

Explores statistical data and defining characteristics of gem-quality CVD synthetic diamonds examined by GIA since 2003.