2. For diamond products, you should also choose diamonds. The choice of diamond mainly depends on diamond 4C and whether it has fluorescence. Gemstone products will have a stone matching link.

(1) Weight: 1 carat = 0.2g = 100 minutes.

(2) Color: Starting from color D, the colors of diamonds for E, F, G, H, I, J ... are as low as I-J.

(3) Clarity: from flawless (FL), internal flawless (IF), very, very unusual sight (VVS 1, VVS2), unusual sight (VS 1, VS2), sight inclusion (SI 1, SI2) and imperfection.

(4) Cutting: Round diamonds are divided into three aspects: cutting grade, polishing and symmetry. The scores of these three items are excellent (EX), very good (VG), good (G), average and poor.

(5) Fluorescence: no fluorescence, weak, medium, strong, very strong.

3.CAD, determine the style details

Inverted mold

5. Finished products, quality control

issue a certificate

7. Delivery and customer acceptance

8. After-sales service