As for what is said upstairs, you don't know it's best not to talk nonsense. Gold can be guaranteed all over the country, except for irreparable goods such as bracelets and ornaments.
As for the fracture of 18K gold, it is not because of any unqualified reasons. Jewelry is very expensive, and unreasonable wearing methods are likely to cause damage to jewelry. For example, once the snake bone chain is folded, it will break immediately and it is difficult to repair. I have never heard of a snake bone chain with good quality and continuous folding. 18K has a high hardness, but you can't compare with steel. He only works hard in jewelry and metal.