TIFFANY & Co. 18K Gold Platinum Schlumberger Sixteen Stone Diamond Ruby X Ring 6 Ring was just polished at Tiffany’s proving authenticity. If any questions please feel free to message me. Jean Schlumberger’s visionary creations are among the world’s most intricate designs. Brilliant diamonds and rubies alternate with graphic X's to create this dazzling ring. 18k gold and platinum Round rubies, carat total weight .65 Round brilliant diamonds, carat total weight .57