new real 18k gold filled-at least 7-10% real gold composition(much higher than USA standard 'gold filled' which is 5% it’s only 14k gold filled) It has a nice weight due to high gold content. It looks and feels absolutely solid gold. ‘K18’ mark on the closure as it is ALMOST solid gold. 100% customers satisfaction with my GOLD-FILLED jewelries chain length: 41cm