The contents engraved on the inner wall of a brand jeweler's non-inlaid ring are generally divided into the following three aspects:
The first is the jeweler's name or English abbreviation. For example, Chow Tai Fook's ring will be engraved with the words ZTF.
Secondly, the material of the retainer, such as s825, where S is the abbreviation of Sterling, followed by the number 825 is the silver content, and Au750, which means that the retainer is made of gold with a gold content of 75%, commonly known as 18K gold, and Pt950, which means that the retainer is made of platinum with a platinum content of 95%.
The high nickel content makes the alloy have effective stress corrosion cracking resistance. It has good corrosion resistance in various media, such as sulfuric acid, phosphoric acid, nitric acid and organic acid, and alkali metals such as sodium hydroxide, potassium hydroxide and hydrochloric acid solution. The high comprehensive performance of Incoloy 825 is shown in the nuclear combustion dissolver with various corrosive media, such as sulfuric acid, nitric acid and sodium hydroxide, which are all treated in the same equipment.