One rocking exhibit

At the Smithsonian Institution, a rare 31.06-carat Wittelsbach-Graff diamond is on display.

At the Smithsonian Institution, a rare 31.06-carat Wittelsbach-Graff diamond is on display.

HT Image

The fascinating thing about this fancy, deep greyish blue diamond is that it was discovered in India in the 17th century, and purchased by London-based jeweller Laurence Graff in 2008 for $24.3 million. Currently it is on display at the Museum of Natural History in New York from October through January 2.