The Hong Kong National Gem Testing Association(IGTA) is a third-party jade inspection and inspection agency established by law. Registration No: 67032357-000-12-16-5. The main inspection activities of the association are mainly jewelry jade and stone determination, diamond classification, synthetic carbon silica(moissanite) quality rating and identification, observation of stone evaluation and determination, noble gold integrity test, and headwear. The thickness and amount of gold in the body and the harmful elements in the first silk Test it.