Rare blue-green diamond sells for record $17.3 million at auction

TL;DR

Reports differ across sources; according to cbsnews.com, blue-green diamond called the "world's rarest" sells for record $17.3 million at auction Rahul Kadakia, president of Christie's Asia Pacific, said that an unspecified private client was the buyer, and the stone took about 20 minutes to sell - an indication that interest was high.