The weight of diamonds is measured in carats. One carat is divided into 100 points. The weight of one carat is 0.2g. Size is the most obvious factor in determining the value of a diamond, but two diamonds of equal carat weight can have a very different values depending on their cut, clarity and color. In recent decades, no new mineral resources have been discovered. As the supply diminishes, natural diamonds of larger size will be rarer and more valuable. Nonetheless, while selecting a diamond, simply look for the size of diamond that suits you best.