The highest quality gemstones are determined by the color saturation. The best value is in colors that are not too light or dark, and have a lot of saturated color. Nearly all gemstones today, including NF Jewelry stones, have been treated to enhance their color. The most common methods of treatment are heating.
Gemstones contain inclusions as do diamonds. Even those most highly prized have at least some inclusions. Flawless gemstones are very rare and very expensive. The best value is found in gems that are lightly to moderately included.
A high-quality gemstone cut is one that presents the most evenly dispersed color. A well cut stone displays the majority of the of the gemstone weight when set in jewelry.
The total carat weight of a gemstone also is a characteristic that can affect the value of the stone.