Brand new! Natural jade, good luck charm, good fortune, health luck. Beautifully cut small green jade, not flashy, with a lovely, dangling design. The hook is 18K gold. There is no certificate, according to the store at the time of purchase. The chain may be 18K gold, but I've forgotten and am not certain. The connecting rings are alloy plated. One jade bead, 5.3mm in diameter, 3.2mm thick. There may be individual differences. Earring body: 3cm