Thank you for viewing. K18 necklace. Necklace for women. Blue stone on the top part. Transparent stones are designed. The back of the top has the engraving "025 006". Probably the blue stone is 0.25 carats. (Size of the blue stone: 3mm wide x 4mm long.) I think the transparent stone is 0.06 carats. (The diameter of the transparent stone is about 1mm.) The top is fixed to the chain on both sides. It is not a type that moves inside the chain. Chain width: less than 1mm. Chain length: 39.5 cm. Weight: approximately 2.1 grams. The clasp has a K18 engraving. Brand and manufacturer name are unknown. The coin is for size comparison. There is no case or box. There are other accessories for sale. Listed 2023/8/10. Oka 15000 Hayashi