Vintage Emerald Cut Ametrine Cocktail Ring in Yellow Gold.  This beautiful vintage cocktail ring features a mesmerizing 17.25 carat emerald cut ametrine set in 14 karat yellow gold. Ametrine is an incredible gemstone mixture of amethyst and citrine that famously shows the purple and orange colors together. This bold Mid-Century mounting holds the stone high above the finger with pronounced bumps on the shoulders.