An Afternoon with the Hope and Wittelsbach-Graff Diamonds

Gary Roskin's "Evening with the Blues" presentation at AGTA GemFair

Gary Roskin, one of the world’s leading gemologists as well as a longtime educator and writer, was one of 10 gem experts who examined and photographed the Hope and Wittelsbach-Graff diamonds—the most famous blue diamonds in the world—to determine whether their origins were the same.

The event took place Jan. 21, 2010, inside