An exceptional and rare orange diamond, the largest known gem of its kind, sold for a record $31.5 million on November 12 at Christie’s in Geneva. The gemstone, which was found in South Africa and weighs in at 14.82 carats, was deemed “fancy vivid,” the top rating for colored diamonds, by the Gemological Institute of America.

Very few pure orange diamonds, or “fire diamonds,” have appeared at auction, with the largest never more than six carats. David Warren, Christie’s international jewelry director, said “To have one that’s over 14 carats is exceptional.” The gem was expected to achieve between $17 million and $20 million.

Sales will continue this week at Sotheby’s when the auction house offers “The Pink Star,” a flawless 59.60-carat vivid pink diamond in Geneva. The stone carries an estimate of $60 million.