... 3.Customised. 4.Own factories,20 years experience black gemstone,semi-precious stone,gemstone. Natural raw materials, and we can do different ... Yasoo is a brand name for global flagship chain of luxury stones under Hongzhi Stone Corporation which has 20 years experience ... in stone industry. The main products offered in Yasoo include gemstone; semi-precious stone; agate, jade etc., specialized for the ...