The key elements in describing color

The color we see in the precious stones is always a combination of pure colors of the spectrum from red to violet pure pure, with varying degrees of brown, white, black and gray. These are the colors later influence in combination with the colors of the spectrum, the sound of the colors you see and make the classification difficult color. For example, if the target is available with red, have a lighter color or shade of red, if black is now a darker shade. Depending on the number of degrees gray, white, black, can cause brown or almost infinite combinations of colors.

Generally, the color of a stone near the spectral tone is pure, is considered the best color, the more it approaches a pure tone, the more rare and valuable. For example, if we are a green stone, the more pure green, the better the color. In other words, the more it comes to a pure green spectrum, which no color (color) in all colors such as blue or yellow, the color is better. There is no such thing in nature but as a completely pure color, the color is always changing from a background of a different color. But these nuances create beautiful, unusual colors can draw, often very desirable