Bvlgari Bulgari 18k Rose Gold B Zero 1 Necklace with Black Ceramic.  Style number 346083.  Current original retail $2450 USD at Bvlgari dot com. Includes box, case, and original certificate of authenticity showing matching serial number from Yorkdale Mall Bvlgari in 2015.  Excellent pre-owned condition.  Ring measures 9mm wide x 13mm diameter and necklace adjusts to fit at 14", 15.5", and 17".