The s990 is not sterling silver. s990 It is the letter symbol of silver ornaments, according to China's "jewelry precious metal purity regulations and naming methods", s990 refers to the silver content of not less than 99.0%, s990 is called silver. Sterling silver is silver with a purity of 99.9% and is generally used as a reserve in the national Treasury.
1. The s990 is not sterling silver
s990 is not sterling silver, it's solid silver.
Full silver refers to silver with a silver content of not less than S99 or S990, and S is the first letter of the English word silver. Sometimes it's written in Ag, sometimes in Chinese.
S990 is high in purity because of its high silver content. So the texture is relatively soft. Therefore, it is not suitable for making inlaid sterling silver jewelry, most of which are used to make plain silver jewelry such as bracelets and silver locks. The jewelry produced by S990 is also relatively textured and beautiful.
2. Definition of sterling silver
At present, the highest purity of the existing science can be refined is more than 99.999%, sterling silver is generally used as a reserve of the national Treasury, so the color of sterling silver should not be less than 99.6%. Silver with a silver content of 99.9%, we call it silver and write s999.
Due to the high silver content is too soft, it is very difficult to cast into the desired jewelry shape, and it is easy to wear and oxidize to black, and the processing cost is too high, so it is not very suitable for jewelry production.