| When purchasing diamonds, it is important to understand how diamonds are graded so that you know exactly what you are paying for.|
Diamond grading covers numerous aspects of each individual diamond's qualities, but there are four grades which are critical to understand: cut, clarity, color, and carat weight. There are additional ratings and measurements noted on a diamond certificate, but they generally fall under the diamond's grade in one of the Four Cs. For example, measurements listed such as "depth" and "table" are part of the description of the diamond's cut.
You can learn more about how diamonds are graded by reading on:
Cut is probably the most important quality factor, and most challenging, of the four Cs to understand. The brilliance of a diamond depends heavily on its cut, which is that brightness that seems to come from the very heart of a diamond. The angles and finish of any diamond are what determine its ability to handle light, which leads to brilliance.
Most diamonds contain some inner flaws, or inclusions, that occur during the formation process. The visibility, number and size of these inclusions determine what is called the clarity of a diamond. Diamonds that are clear create more brilliance, and thus are more highly prized, and priced.
Colourless diamonds are the most desirable since they allow the most refraction of light (sparkle). Off-white diamonds absorb light, inhibiting brilliance.
A carat is the unit of weight by which a diamond is measured. Because large diamonds are found less commonly than small diamonds, the price of a diamond rises exponentially to its size.