Gemstones that have a color that is closest to a pure hue are more desirable and valuable though stones with these characteristics are rare. The intensity and degree of saturation of the stone's color is also an important factor that will help you to determine the quality of your stone.
Some gemstones such as amethyst can lose their color after prolonged exposure to direct sunlight. The setting style used for the gemstone can also affect its color.
The gemstone's color can also be used to create a focal point in the jewelry piece or metal can add a subtle contrast in color within the piece. Metals of varying shades can accentuate the color of stones. Decorative work such as enameling and patination can also enhance the beauty of colored stones.