Research & News
Fancy Colors, History Ruled 2018 Auctions
World-class fancy colored diamonds and truly historic jewels highlighted the 2018 auctions, but total jewelry sales were down from 2017.
Uncommon Parallel Color Zoning in a Chameleon Diamond
A diamond examined in the Carlsbad lab shows chameleon coloring in an unusual pattern.
Chipping Away at the 1,109 ct Lesedi La Rona
Graff reveals the first polished diamonds produced from the Lesedi La Rona, one of the largest pieces of rough ever mined. Plus, other market news.
Dreher Carvings: Gemstone Animals from Idar-Oberstein
Review of Dreher Carvings: Gemstone Animals from Idar-Oberstein by Wilhelm Lindemann, Will Larson, and Ekkehard Schneider.
15 Carat HPHT Synthetic Diamond
A synthetic diamond seen in the Carlsbad lab is the largest faceted lab-grown diamond examined by GIA.
US Holiday Season Opens Well, Despite Volatile Markets
The US holiday shopping season is looking positive, despite signs that an economic slowdown may be coming in 2019. Plus, more auction sales records.