Typically, there are 4Cs that describe the qualities of a diamond. These include Clarity, Cut, Colour and Carat. We have already described what Clarity of a diamond means. Let's know in detail about the other 3 Cs. Colour - Diamonds are defined by their colour grades. Furtjer, this decides their price, as well. People love buying diamonds that fall into grades D to F - the grade range for colourless diamonds. These are rare and hence costly. Cut - The cut of a diamond determines how the light which enters into the diamond from the above will be reflected back to the eye of the observer. It is worth noting that a perfect-cut diamond reflects light to its optimum. Carat - The weight of a diamond is measured in Carat. One carat is equal to 0.20 gram. The price of a diamond defines its cost. For example, a diamond weighing 0.99 carats will have a low value. People usually prefer buying a one-carat diamond. A diamond with a deep cut won’t show extreme brightness. But a diamond with a shallow cut will leak the light and would never be as bright as an ideal cut diamond.