Rare NWOT JTV Gold over Sterling Silver Ametrine and Yellow Sapphire Ring For those that don't know: Ametrine is a very rare gemstone that is half Amethyst and half Citrine and occurs naturally in only one mine in Brazil Outstand piece of gemstone jewelry. 10mm x 12mm Rectangular Competition Quantum Cut of Natural Ametrine. The shoulders are set with Natural Yellow Sapphire Rounds all of excellent color and clarity. I know the Sapphires are Natural not only because they test as Sapphire 18K Yellow Gold over Sterling Silver Natural Ametrine Natural Yellow Sapphire Sz 6 3/4 The ring is hallmarked 925 Thailand and has a makers mark as well