This is an authentic VAN CLEEF & ARPELS 18K Yellow Gold Diamond Onyx Green Chalcedony Blue Chalcedony Interchangeable Bow Door Knocker Necklace. This necklace is finely crafted of 18 karat yellow gold and features a bow motif pendant with diamonds approximately .08 total carat weight. The pendant holds interchangeable onyx, green chalcedony, and blue chalcedony door knoker shaped pendants. Follow this item for alerts. Van Cleef & Arpels is a registered trademark of Van Cleef & Arpels. FASHIONPHILE is not affiliated with Van Cleef & Arpels.