8.25 CTTW Sky Blue Topaz and Amethyst Bangle set in 18k Gold over Sterling Silver Bangle beauty: amethysts and blue topaz mingle along a gleaming 18k gold overlay bangle. The pastel look won't fail to impress with its wow factor. Ten 6mm genuine oval cut blue topaz ~ 5.50 ct Eleven 4mm genuine round cut amethysts ~ 2.75 ct 7" 18k gold overlay* on sterling silver bangle * Superior to mere traditional plating, an 18k gold overlay provides the quality look, feel and durability of gold.