ART DECO 10K YELLOW GOLD AMETHYST RING Antique Art Deco 10K yellow gold amethyst ring, set with one rectangular-cut faceted amethyst approx. 10 x 7 mm. Marked: "10K" with maker's mark. Ring measures 0.87"L x 0.43"W at widest section. Size: 5. Approx. 1.5 dwt. inclusive.