NQTC carries out the international ISO/EC17025 standard, carries out the overall quality management, establishes the scientific and perfect management system, carries on the gold, silver, jewelry and jade jewelry inspection/inspection/appraisal and other businesses in strict accordance with the international standard.


Soft Jade, Hetian Jade, Jade, Jade, White Jade, Green Jade, Jade, Black Jade, Jade, Opal Sugar, White Opal, Black Opal, Fire Opal, Chalcedony, Agate, Aquamarine Pulp, Chalcedony, Macao Green Jade, Topaz Pulp, Huang Longyu, South Red Agate, Wood Alexandrite, Tiger Eyes Stone, Eagle's Eye, Quartzite, Dongling Stone, Serpentine, Jade, Dushan Jade Long, Check Luo Shi, Sodium Shi Yu, Rhodonite, Actinolite, Turquoise, Lapis, Malachite And Chrysocolla, Grape Stone, Marble, White Marble, Kai Yu, Smithsonite, Dolomite, Fluorite, Water Grossular, Talc, Boron, Silicon Calcium Stone, Hydroxyl Silicon Boron Sodium Calcium Stone, Square Stone, Hematite, Natural Glass, Obsidian, Shoushan Stone, Qingtian Stone, Brucite, Su Ji Stone, Heteropolar Ore, Mica, Muscovite, Lithium Mica,Needle Sodium Calcium Stone, Chlorite