Many of us believe that large gemstones are always valued more than small ones. It would seem that this is quite logical - "the more, the better." But jewelers and true connoisseurs know that this rule does not always work in the world of precious minerals. After all, their price is formed from many factors. There are four main parameters that determine the value of a stone. Its clarity, cut, carat weight and color. For example, a 5-carat emerald with cloudy inclusions and a muted color will be much cheaper than a very transparent, bright and rich in color 1-carat emerald.