Tips On Buying 18k Gold Jewellery 18K gold contains a higher percentage of pure gold than 14K gold, which increases its value and price. 18K gold is made with 75% pure gold and 25% alloyed metals containing either copper, nickel, zinc or silver. Hallmarks are an easy way for buyers to identify exactly what they’re purchasing. To identify 18K gold, look for a stamp that reads 18K or 18Kt. For more information visit us at yasini.com. in Public bookmarkswith 18k-gold-jewelleryby 11 users