Vintage Marquise Emerald and Diamond Ring in 18K GoldA natural marquise cut emerald sits prominently at the center of a 18K gold band with glittering round cut natural diamonds accompanying the beauty of a natural emerald stone. As always we use solid gold to have the highest quality possible, and craft pieces that last a lifetime. Ring Features Gold Kt: 18K Solid Gold (stamped for authenticity) Available Gold Colors: Yellow Gold Center Marquise Cut Emerald Weight: 0. 38 carat Total Diamond Weight: 0.