FOUR NATURAL JADEITE RING SURFACES. Biggest Jadeite only size 16 mm by 11.3 mm by 6.2 mm. Smallest one 12.2 mm by 10.3 mm by 5.1 mm. Guarantee Natural Jadeite. GIA certificate is available upon buyer's request and cost. If fail to acquire GIA certificate, Consignor guarantee to refund. From a Hong Kong jewelry dealer.