Petra Diamonds
The Cullinan mine continues to produce large stones. The Cullinan Heritage, a white diamond, was discovered in September 2009. This stone was the 19th biggest uncut diamond ever found and was sold in February 2010 to Chow Tai Fook Jewellery for $35.5m, the highest price ever paid for an uncut diamond. The previous record was held by Gem Diamonds' Leseli La Letšeng, which was bought for $18.4m by Graff Diamonds in December 2008.
Mega-Gem
"Mega-Gem" was fabricated in 1989 with the resources of Cincinnati art dealer Carl Solway. It was presented at the Chicago International Art Exposition, where it was located on the Navy Pier in Chicago, Illinois. The presentation of "Mega-Gem" was promoted through posters and buttons proclaiming the sculpture to be the largest diamond in the world, weighing over 360 million carats. "Mega-Gem" was considered by Torreano to be one of a series of "oxy-gem" sculptures, playing on the oxymoron of combining precious gems with materials of lesser value, such as a "plywood gem," "gold gem," and "Mega-Gem" as "aluminum gem." "Mega-Gem" is one of Torreano's oversized and exaggerated jewel sculptures.