Roberto Coin stamp on clasp for authenticity/ Italy 18 KT on other side - see photos. Matching bracelet under separate listing. The item "Roberto Coin 18K Gold Bollicine Necklace withDiamonds Gently Used (New $4200)" is in sale since Sunday, August 26, 2018. This item is in the category "Jewelry & Watches\Fine Jewelry\Fine Necklaces & Pendants\Diamond".The seller is "bigdownsize" and is located in Malibu, California. This item can be shipped to United States.