This is an authentic DAVID YURMAN Sterling Silver 18K Yellow Gold Black Onyx Quatrefoil Enhancer. This unique enhancer is composed of sterling silver and features a carved black onyx stone in the shape of a quatrefoil that is set in 18 karat yellow gold. Add this beautiful enhancer to any necklace for a look of distinction only from David Yurman. Follow this item for alerts. David Yurman is a registered trademark of David Yurman. FASHIONPHILE is not affiliated with David Yurman.