How pure is eighteen carat gold?

Very tricky! No, 24 Carat gold is not pure gold, but a diamond of that weight would be impressive indeed. Carat with a 'C' is a weight measure used for gemstones. Karat with a K, as you will see...

24k gold is pure gold but is too soft to be used for much. So it is usually alloyed with copper and silver to make it harder.

22 carat gold is 91.66 percent pure gold. Since 100% pure is impossible 24 carat, at 99.999% pure is considered as 'pure'. 18 carat, which most jewelry is made of is about 75% pure gold. A carat is...

Pure gold has 0 carats. It is however generally accepted that 24 karat gold is the purest gold as it is 24 parts gold and 0 parts alloy or base metals.

Pure gold is 24 Karat (carat with a C is a weight unit).