View cart “Onyx and Marcasite Brooch in Sterling” has been added to your cart. JewelleryRings 0.84ct Diamond and Black Onyx 18ct Rose Gold Ring JewelleryNecklaces Coral and Onyx Necklace JewelleryNecklaces Coral and Onyx Necklace Antique PiecesBrooches Onyx and Marcasite Brooch in Sterling EarringsJewellery Pearl and Diamond Earrings in Onyx and 18ct White Gold