Wow! That’s one big rock! A massive diamond is the most expensive jewel ever sold at auction. The pink star diamond was auctioned off at Sotheby's in Hong Kong on Tuesday, and the winning bid of $71-million dollars came in by phone. This sucker is even bigger than anything in Kim Kardashian’s jewelry box. It’s close to 60-carats! And this same diamond ring sold at auction in Geneva back in 2013 for $83 million…but that buyer defaulted on the sale.