100% Authentic Tiny Treasures Collection Diamond Baby Cross Necklace by Designer Roberto Coin. Description: NEW18kt YELLOW gold baby diamond cross 0.11 ct necklace imported – Italy. Tiny Treasures Collection with Roberto Coin’s signature ruby on back. Stones: Diamonds + Signature Ruby on back of cross. Diamond Carat Weight: 0.11. Cross: 1/2cm (5mm) wide 7mm long….