Nobuko Ishikawa Necklace Black Diamond Engraved Diamond 0.32ct Black Diamond 202.64ct Pt900 K18 The size of the black diamonds is about 5.7mm near the adjuster and about 7mm near the top (approximate size measured with a household caliper). The weight is about 45 grams on a household scale, and the length is about 40 cm. I had it looked at the other day at the as time department store, and they said the wire inside is double, so it's fine (the diamonds won't come apart if it breaks). I liked it and wore it regularly, so there are some chips characteristic of black diamonds in places. Please understand. No returns. Please confirm any concerns before purchasing. Color: Black系 (Black-based) Material: K18 (18 karat gold) Decoration: Diamond Accessories: None Scratches/Discoloration: Yes