What the difference between 9ct and 18ct?
Pure gold is very soft so other metals are added to the gold to make it stronger and more suitable for use as jewellery. The carat (ct) of gold states what percentage of pure gold is in the metal; 9ct is 37.5% pure gold where as 18ct gold is 75% pure gold. 18ct Gold is more rich in colour and won't tarnish over time whilst still being strong and will last generations (so long as it's looked after properly)... and needless to say is more valuable.