K18 screw necklace. The gold is connected in rings and then finely screwed, giving it a light and glamorous appearance. I haven't been able to photograph it well. When placed on a flat surface for photography, the screw part flattens, but it screws when hung. I received this item as a gift, so I don't know where it was purchased. Gold prices are rising, so no price reduction is possible. The hallmarks are K18 and 750, which indicates the gold content of 750/1000, and K18 has the same meaning. I confirmed it as K18 at a certain買取 (kaitori - resale/purchase) shop, but the design was so lovely that I bought it back and decided to sell it to someone who wants it. It has an adjuster for length adjustment (photo 9). Please check the hallmarks in photos 10 and 11. Total weight: 2.69g Length: 40cm Width: Approximately 2mm No price reduction, and no returns to prevent product substitution. Stored at home. Material: K18 (18k gold) Decoration: None (chain necklace) k18 necklace screw necklace 18k gold pendant glamorous stylish