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.

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.

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

A large scale gemstone mining company seeks to change the way the world acquires and sells fine gemstones.

Review of Hazel Forsyth’s The Cheapside Hoard: London's Lost Jewels..

Diamond and jewelry demand in the U.S. rose an estimated 3% to 4% this past holiday season, but business was uneven.

宝石商と宝石鑑定士は研磨されたダイヤモンドの一部を説明するために特定の規定用語を使います。 若干の形や比率の寸法もラウンドブリリアントダイヤモンドのカットグレードに影響を与えます。

Review of Damiani: Alchemy of Desire.

GIAのチームと共にザンビアの Kagem（カジェム）エメラルド鉱山を訪れ、世界最大級とされるエメラルド鉱床の概要を見てみましょう。 この操業形態は、カラーストーン業界に革命を起こしています。

Retail analysts puzzle over the reported steep drop in post-Thanksgiving shopping numbers; online sales have risen strongly.

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

Join GIA on location at the Montepuez ruby mine in Mozambique, the most important ruby discovery of this new century.