Both "carat" and "karat" refer to different things.Carat refers to the weight of a diamond or other gemstone. One carat is equal to 0.2 grams or 200 milligrams. The carat weight of a diamond is one of the four Cs (carat weight, colour, clarity, and cut) that determine its value.
Karat, on the other hand, is a measure of the purity of gold. It is typically denoted by a "k" or "kt" and can range from 8k to 24k. 24k gold is pure gold, while 18k gold is 75% pure gold and 25% other metals, such as copper or silver. Lower karat gold is less pure and typically less valuable.In summary, carat refers to the weight of a diamond or other gemstone, while karat refers to the purity of gold. It's important to know the difference between these two terms when shopping for jewellery or when discussing diamonds and gold with a jewellery.