'The Pink Star'
Alastair Laidlaw/Sotheby's via Bloomberg
"The Pink Star," a 59.60-carat colored diamond. The oval-cut stone, the largest internally flawless fancy vivid pink diamond ever graded by Gemological Institute of America (GIA), sold for $83 million -- a record for any gemstone at auction -- when was auctioned by Sotheby's in Geneva on Nov. 13. It was estimated to raise more than $60 million.