Besides rigorous quality control for raw materials and production process, each batch of goods must be 100% full inspection in sizes and appearance before shipment. Please don’t forget to view our “Quality Control” page for more information.
≥10 Sizes 100% Full Inspection
Sizes inspection including: diameter, height, diamond thickness, chamfer and geometrical sizes(verticality, roundness, flatness, parallelism, value of R)
≥20 Items of Appearance Defect 100% Inspection
Appearance inspection including: cracks, edge chips, scratch, delimination, pit, black spot, irregular color, corrosion, etc. The appearance is inspected by 20X microscope.