When we talk about 18 carat gold, we mean the percentage of pure gold used in a piece of jewellery. 18 carats contains 18/24 parts gold and 6/24 parts other metals that, among other things, determine the strength and colour of the gold alloy. For example, copper is added for rose gold and palladium for white gold. All KUBINI jewellery can be made in 18 carat yellow, (palladium) white, champagne and rose gold.