Sotheby's (BID) announced that 101.38-carat diamond was sold for HK$95.1M ($12.3M) to an unknown buyer for Cash - Bloomberg.The auction house was ready to take Bitcoin or Ether as a payment for the pear-shaped flawless diamond, estimated to fetch as much as $15M.Citing the rising popularity of cryptocurrencies for payment, Auction houses are increasingly accepting them.Last month, Phillips offered a piece from street artist Banksy for Ether or Bitcoin.Christie’s accepted payment in Ether in March for the record $69.3M sale of Beeple’s “Everydays: the First 5,000 Days."