Gold Plated Necklace I received this from my family about 30 years ago. I can't say for sure because I don't have a certificate of authenticity or the original box, but I was told it was gold-filled or gold-plated. It has a luxurious look, and at first glance, it looks like 18k gold. I've only used it a few times and kept it stored away, but please consider that it has aged over time. ① Marked "NS". The "NS" or "SN" hallmark on precious metal jewelry generally indicates that it was manufactured by Nakagawa Soshingu Kogyo, a Japanese company. This mark suggests that the product is likely a plated item rather than pure precious metal. ② Marked "pat.pnding". This is an abbreviation for "Patent pending," meaning that a patent application has been filed. This mark indicates that the product or a part of it (especially the clasp, etc.) uses patented technology, but the patent has not yet been registered. #Necklace #Gold Plated