Does anyone know why there are about 4000 carats in the purest form of gemstone, such as Ruby and Sapphire (Guinness Book of Records), and there are only 24 carats in a brand new slab of gold which is as soft and pure as can be? Carats are worked out from the number on your ring, like the small number which you can find. It's like this; guess the number of standard carats for the nominator (number on top of a fraction) and then divide it by 24 carats (if it is gold that is). The answer is that small number inside the ring! So you can tell how many carats it is! It's like this: 9÷24X1000=375 You must use 1000 for this to work properly. P.S. I asked my chemistry teacher, and even she doesn't know! Davo.