Why can't I buy a platinum ring with a purity of 990 at the best jewelry store in Nanjing? Don't you sell 990 ornaments now?
First, you can buy it online. Save you from running around the world. Secondly, there is a reason why no one sells 990. 990 sounds good, but I can't think of anything good about making jewelry: the metal of 990 is soft and easy to hang flowers. If you want to preserve your value, you might as well buy a gold nugget and hide it at home. Jewelry is to be worn, and buying a wear-resistant 900 may be "hard".