What does this jewelry stamp/mark mean?

The necklace is stamped ATI BRCH or BRCN. [image deleted]

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ATI abbreviation means, "Artist's, manufacturers MARK on silver jewelry chain." The BR marking stands for Brass Rhodium. Rhodium is a precious metal that is in the same family as platinum. For rhodium plated jewelry, it involves plating the jewelry with a surface that guards against scratches and also gives it a reflective white appearance. The CN means it was made in China.

morrgin · F

@DunningKruger if it was only plated would it be marked as such