The world’s economic turmoil has begun to catch up with the superrich, who comprise most of the demand for the top gemstones, diamonds and designer jewelry pieces offered at BaselWorld 2015.

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。

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。

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

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

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.

Reports preliminary findings—based on FTIR and Raman spectrometry of more than 300 samples—on distinguishing natural and synthetic emeralds using vibrational spectroscopy.

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.

Our lead article discusses the sweeping changes brought to rough diamond pricing and supply through the adoption of tenders and live auctions.

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

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

Review of Mimi Lipton's Untamed Encounters: Contemporary Jewelry from Extraordinary Gemstones.

Review of Damiani: Alchemy of Desire.

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

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

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

The Stayish mine in Ethiopia’s Wollo province has been producing black opal since 2013.