James Avery Oval Amethyst Ring Sterling Silver RG-1417 Size 6.25James Avery “Oval Amethyst” Ring Sterling Silver RG-1417 Size 6.25. Set with an approximate 11 x 9mm oval faceted enhanced amethyst. Check Back Often Listing New Items Daily. Call if you have any questions. Buyers in the State of Texas. You can send a message.