American Museum of Natural History Unveils Wittelsbach-Graff Diamond,10/28
The American Museum of Natural History will unveil the Wittelsbach-Graff Diamond for public view on Thursday, October 28, in the Museum's Harry Frank Guggenheim Hall of Minerals. The Wittelsbach-Graff Diamond is an extraordinary 31.06-carat natural fancy deep blue diamond that will be on display at ...