Diamonds, more than any other gemstone, have the capacity to produce the maximum amount of brilliance. And a diamond that is virtually free of inclusions is of the highest quality, because nothing interferes with the passage of light through the diamond. To determine a diamond's clarity, it is viewed under a 10-power magnification by a trained eye. Minute inclusion neither mars a diamond s beauty nor endangers its durability. Like all precious stones, the weight, and therefore the size, of a diamond is expressed in carats.
Size is the most obvious factor in determining the value of a diamond.
But two diamonds of equal size can have very disparate values, depending on their quality. Diamonds of high quality can be found in all sizes.