Tennis ball-sized diamond could fetch $70 million at auction

May 4, 2016

Tennis ball-sized diamond could fetch $70 million at auction

It’s a rock for the ages. A 3-billion-year-old diamond the size of a tennis ball — the largest discovered in over a century — could sell for more than $70 million, auctioneer Sotheby’s said Wednesday. The auction house plans to offer the Lesedi la ...