A carrot is an orange vegetable and has nothing to do with jewelry - it is a favorite of rabbits.  But if you are talking about carats, then you are talking about the weight of gems.  A carat is 1/5 of a gram and there are 28.3 grams in an ounce or 141.5 carats in an ounce. When you see ct after a number it's referring to the weight of the gem.  Now just to make things more confusing we have karat which is the purity of gold. and is written as kt.  A 24kt gold item is pure gold.  A 14kt gold ring would be 58.3% pure and in the US the most popular type in jewelry - in Europe 18kt or 75% pure is the most popular.