Acorn NecklaceAdorable acorn charm, handmade in solid bronze and suspended on a 16 gold filled chain. Material Information: Bronze is an alloy metal containing copper and tin; our bronze pieces are nickel free. It has a warm golden color, making it a durable alternative to gold at a much more affordable price point. Bronze, like sterling silver, will gradually darken over time; this is a natural oxidation process and not damage. A quick polish with the cloth