Japan Gem Association (Nichibo Kyo) with Simple Identification Certificate The Japan Gem Association is a reputable identification organization in the gem industry. The fittings attached to the natural amber are K18 (18K yellow gold). There are 3 natural diamonds, with a 0.02 carat stamp. Openable bail (2-stage lock) Comes with a 3mm bead, long necklace (60cm)! (60cm from the clasp to the plate) Clasp (5mm diameter), clasp, and plate are K18 (18K yellow gold). The necklace clasp is an "easy-to-use" type, making it easier to open and close. It has a larger hook than the conventional type, making it easier to use. The bead necklace has not been given a simple identification, but I believe it is amber^^; Please understand that we have not been able to provide identification for the necklace due to various circumstances, such as the cost of identification. Originally, it was a new/unused item, but there were many minor chips and scratches on the amber, so we polished it. There are no noticeable chips or surface scratches now. It can be used by both men and women, and it's a great value for the price. The 18K parts (openable bail, clasp, plate, and round ring) alone are worth about 18,000 yen at current market prices, so it's a good deal for those who love amber. Unlike other gemstones, amber is not a mineral but a fossil, so it feels romantic! The images are everything! If you would like additional images, please feel free to let us know. Please consider purchasing on the premise that it is a new/unused item ♡ m(_ _)m P.S. Origin unknown. Unfortunately, there were no insects.