ITEM DESCRIPTION AAA+ Grade Blue Chalcedony oval Cabochon Natural Gemstone Fine Fire loose stones. 100% natural and genuine gemstones. Different sizes we offering here , you can choose any option as your needs. If you need these as pair let me know, Will make arrangements. Fine luster and clean clarity. Weight as Size : 12 x 16 mm : 8 - 9 Carats 13 x 18 mm : 14 - 15 Carats 15 x 20 mm : 15 - 16 Carats