18K GOLD DIAMOND NATURAL JADEITE NECKLACE. Jadeite only size 19.5 mm by 12 mm by 4.5 mm and 21 mm by 11.5 mm by 4 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 Company.