This is an authentic ROBERTO COIN 18K Yellow Gold Diamond Duchessa Satin Doorknocker Earrings. The earrings are crafted of 18 karat yellow gold and feature circular drop motifs in a satin finish accented with diamonds, approximately .10 total carat weight, along with synthetic rubies on the back. Follow this item for alerts. Roberto Coin is a registered trademark of Roberto Coin. FASHIONPHILE is not affiliated with Roberto Coin.