Case 2: procurement, research and development, sales of diamonds, precious stones, jewelry, gold and silver jewelry and inlaid ornaments, and the purchase and sale of their accessories; Other domestic commercial and material supply and marketing industries (excluding franchised, specially controlled and monopolized goods); Engaged in the import and export business of goods and technologies (except those expressly prohibited and franchised by the state); Property leasing, jewelry and diamond inlay design. (Except for items that need to be approved before registration as stipulated by laws, administrative regulations and the State Council decisions).
Case 3: R&D, production and sales: composite diamond tools (including diamond cutters and diamond abrasives), synthetic diamond materials (including diamond powder, catalyst column and purified powder), alloy materials (including pre-alloyed powder, composite powder and alloy catalyst) and jewelry diamonds (including synthetic diamond, colored gems, jewelry, jade articles and craft ornaments) (excluding cultural relics).