12x16mm Amethyst Statement Ring 925 Sterling Silver, Large Purple Amethyst Ring. This ring contains genuine Amethyst gemstone measuring 12x16mm in a prong. This ring is 925 Sterling Silver and platinum plated, also available in Gold, or Rose Gold Plating. This item includes a gift box an a certificate of authenticity with purchase. This item is made to order, please allow up to 10-15 days for processing and delivery.