Not sure honestly, the materials came to me in a unmade set, I do know the hook posts for the earrings are surgical steel, from my supply of earring posts. The brown between the medallion and the bead on the necklace is brown cotton blend cord, but there are no other markings on the pieces. Honestly, to me they look to be pewter or some other common medal and then the gold looks to be enamel that was glazed and sealed over the item. The chain to I am not sure of, but if it is not liked, you can easily find a finer chain and just change it off the chain it is on.