A simple platinum and diamond necklace. It is from Kumikyoku Jewelry, a brand that has now been discontinued. This is fine jewelry, not an apparel accessory. The chain is marked Pt850, and the pendant top is marked Pt900. There is also a 0.10 mark and the Kumikyoku mark "k" engraved on the back of the pendant top. These were difficult to confirm with the naked eye, so they were checked with a microscope. Purchased at Isetan Shinjuku a few years ago. No accessories such as a case or warranty card; only the item itself. Chain length: approximately 43cm Pendant top: approximately 1cm long, 6mm wide