Purchased at a department store for 55,000 yen. I haven't had a chance to wear it, so it's been stored in a jewelry case. It's a choker type, so the length is short: 40cm. Only the clasp is pt850 (photos 7 & 8). It's a sturdy construction. Back of the necklace (photos 9, 10, & 11). Size of one onyx stone: approximately 5mm. Approximately 9mm including the surrounding frame. Flower motif: approximately 7mm.