GIAの標準試料を収集するため、GIAのフィールドジェモロジストたちは2012年と2013年にタスマニア北東部のWeldborough（ウェルドボロー）近くにある、サファイア鉱床を訪れました。

これまでにGIAが検査を行ってきた中で最も大きなHPHT合成ダイヤモンドを検査したところ、この成長技術における著しい進歩が例証されました。

Join GIA’s field gemologists as they venture into some of Brazil’s most important and productive emerald and tourmaline mines.

Liddicoatite – a calcium-rich lithium tourmaline – was recognized as a separate mineral in 1977 and named in honor of Richard T. Liddicoat, the second president of GIA who is often referred to as the “Father of Modern Gemology.”

2014年のホリデーシーズンにおける宝飾品と時計の総売上高は、前年の11月および12月と比較して金額で1.4%減少しました。

Ten loose pearls with interesting shapes and internal growth features were from Pteria-species mollusks.

Auction price records were broken in late 2014 as ultra-wealthy buyers vied for rare, important gemstones.

Examination of a pink-purple spinel revealed what appeared to be a spinel crystal inclusion.

Presents spectroscopic and phosphorescence data of the Blue Moon, a 12.03 ct Fancy Vivid blue diamond discovered at the historic Cullinan mine in early 2014.

Nine demantoids reportedly from a new deposit in the Khuzdar area in Pakistan’s Baluchistan province were recently examined.

Melee diamonds can be efficiently screened for synthesis and treatment using infrared absorption spectroscopy, DiamondView imaging, and microscopy.

Describes the extremely rare polished pink diamonds from Australia’s Argyle mine that have been sold for 30 years through invitation-only tenders.

Review of Damiani: Alchemy of Desire.

Review of Yvonne J. Markowitz and Denise Doxey's Jewels of Ancient Nubia.

Strong absorptions from N-V centers were the main cause of a CVD synthetic diamond’s pinkish orange bodycolor.

Examines the growing percentage of rough diamonds being sold through auctions, a shift that has caused price volatility while opening up supply to more manufacturers and dealers.

Although this stone bore some superficial resemblance to moissanite, its gemological properties were consistent with HPHT synthetic diamond.

What appeared to be high-quality jadeite was actually dyed green marble with calcite as the main mineral.