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.


Synthetic Diamond, Synthetic Corundum, Synthetic Sapphire, Synthetic Ruby, Synthetic Chrysoberyl Beryl, Synthetic Emerald, Synthesis, Synthetic Alexandrite, Synthetic Spinel, Synthetic Opal, Synthetic Crystal, Amethyst Synthesis, Synthetic Topaz, Synthetic Smoky Quartz, Green Crystal Synthesis, Synthetic Rutile, Synthetic Turquoise, Synthesis Of Cubic Zirconia, Synthetic Moissanite