Colored gemstones can be faceted or cut in a cabochon or facet style. In general, faceted gemstones were favored in the United States until recently, so the best materials were usually faceted. 

A faceless cutting style of high end jewelry brands provides a smooth, faceless surface. This cut can be of any shape. A cutting force consists of applying a stone to very small areas at different angles, such as in a different diamond engraving. 

The placement, angle, and shape of the surface or veneer are carefully planned and executed to show the inherent beauty of the stone. Fire, color, brilliance, with full advantage. 

There have been many-faceted styles these days, including a "fantasy" cut that combines a round surface with a sculpted back. Color and cut are the most important criteria in determining the beauty of colored stones. After that, the carat weight must be taken into account. The greater the weight of one carat usually increases the price per carat, usually in a non-linear relationship. 

If colored gems are premium material of good quality, a fine cut will maximize its natural beauty and allow it to show its best color and vitality. If the same material is poorly cut, its natural beauty will be diminished, making it appear dark, too light, or even "dead".

So when you are exploring a colored stone that is clear to your eyes and is a great color; neither too dark nor too pale, one could assume that the cut was relatively fine. If the gemstone is poorly colored or lacks vitality, then you should check it for the correct cut.