What do mean by 24 carat gold and 18 carat gold?

Answer 1

24 carat gold is pure gold. The purity of gold is measured as a ratio out of 24. For example; 18 carat gold is 18 parts of pure gold and 6 parts of other alloying metals such as silver, copper and any other metal depending on whether it is rose gold colour, white gold colour or yellow gold colour.

So in 18 carat gold, 18/24 = 0.750 which is a number that also characterises 18 carat gold.

The typical Swiss hallmark defining 18 carat gold was the figure of a woman's head

Hope this answers your question.

Answer 2

A karat signifies how pure gold is and the higher the more gold there is. Pure gold, which is 100%, is too soft to use so it often has other metals mixed in to make more durable. 18 karat gold means that it has 75% gold in it. 24k gold is pure but too soft to use, so it is mixed with other metals to strengthen it.

Answer 3

The term "carat" refers to the purity of gold, with 24 carat being the highest purity at 99.9% gold content. 18 carat gold is 75% gold mixed with other metals like copper or silver for added strength. The higher the carat, the more valuable and pure the gold is.