28mm Rock Chic necklace in 18k gold vermeil on sterling silver. The base metal of all our jewellery is 925 sterling silver. Vermeil means that sterling silver is plated in at least 2.5 microns of gold or rose gold. Ours is at least 3 microns of 18k gold / rose gold which makes for a really thick coating of gold / rose gold on sterling silver. Eliza Bautista Rock Chic Studded Hoop Earrings in 18k Gold Vermeil