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.
McPherson College
In 1926, J Willard Hershey synthesized one of the world's earliest synthetic (man-made) diamonds on the McPherson College campus. Reporting on his experiments, Hershey wrote, "Since we first began our experiments in their manufacture more than 50 diamonds have been made synthetically at McPherson College, ranging in size from the smallest, one millimeter (about 1/25 inch) in diameter, to the largest, which, is two millimeters by one and one half millimeters by one millimeter, weighing 1/30 carat." One of the diamonds is on display at the McPherson Museum in McPherson, Kansas. There is some debate about the success of Hershey's experiments, with some researchers concluding that the diamonds were not true diamonds and others concluding that some of them were.