Jewelry produced by regular manufacturers must be stamped.

Necklaces and pendants are diamond ornaments together, so pendants should also be clearly marked (precious metal composition and gem weight)

If the necklace and pendant are not together, of course, there must be a clear component identification.

Nowadays, many fake ornaments, especially white metal, are difficult to distinguish with the naked eye and must be identified.

Of course, if you are engaged in this industry all the year round, you should be able to see it from the weight and color.