Dillon Studs OnyxGold plated brass earrings, ear posts are gold plated sterling silver (scroll down to learn about gold plating and gold fill) 3mm genuine black onyx 20mm height All Merewif gold plated jewellery is 100% brass with sterling silver ear posts beneath the gold plate. They use a much thicker gold plate than the industry standard, and once the pieces are plated, a protective finish is added to prolong the life of the gold plate. There is no nickel in any of