ライトニングリッジは、オパールの中でも最も望ましい上質のブラックオパールにおける、世界の中心地です。 2015年6月には、GIAのフィールドジェモロジストのチームが、オーストラリア、ニューサウスウェールズ州にある、この伝説的な町を訪問しました。 この上質なオパールの重要な原産地を共に探索しましょう。

Emerging artist Trishala Ashok – who has won multiple design awards – looks beyond the mundane and minutiae of daily life to create her jewelry.

モンタナ州のロッククリークサファイア採鉱地区をGIAのフィールド調査で訪問し、原産地から直接これらの美しい石を収集する様子をご覧ください。

A summary of the content found in the Summer 2016 issue of Gems & Gemology.

Review of If These Jewels Could Talk: The Legends Behind Celebrity Gems, by Beth Bernstein.

Five large HPHT synthetic diamonds, examined at GIA’s Hong Kong lab, indicate the advances HPHT growth technology has made in quality and size.

Located near the Arctic Circle, Diavik is one of the world’s richest diamond deposits and a leader in sustainable mining.

Boulder opal in sandstone matrix is seen as beads in Tucson.

Testing identifies a new treatment method as the cause of color in beeswax amber.

Examination of shells from on P. mazatlanica proves the similarities between that species and P. margaritifera.

Master cutter Kiwon Jang demonstrates his newest cutting machine at Tucson’s AGTA show.

A first-person account of cutting a 3,019 ct piece of white opal to create a 1,040 ct gem with play-of-color across the surface.

Hardstone figures of two Russian imperial bodyguards, commissioned in 1912 by Nicholas II, demonstrate the House of Fabergé’s meticulous detail and craftsmanship.

A quartz double cabochon showcases a garnet placed to imitate an inclusion.

The first triplite inclusion in a topaz host is examined.

Sapphires from Russia’s Ilmen State Reserve may provide insight into gem corundum from secondary placers.

Inclusions in technogenic ruby slag help to separate this material from other specimens, both natural and synthetic.

Blisters examined in the Bangkok lab have been treated with an artificial filler.