Ladies Yellow Gold Filled Black Onyx Ring. Size S (9). New and comes in a gift pouch. Stylish design set with a large rectangle black onyx simulated crystal stone. Smaller black stones on side band. Stunning design that looks fabulous on!! What's gold filled Jewellery? Gold filled is an actual layer of gold-pressure bonded to another metal. Gold filled jewelry is not the same as gold plated jewellery.It is tarnish-resistant like solid gold and is safe for most people with sensitive skin who can wear solid gold jewellery.