Three components measure ruby. These are tone, hue, and saturation. The tone is a measure of the depth of red. This describes whether the red is dark, medium, or light. Medium to medium-dark is considered the best red color.
The famous red gemstones names at https://cwordsworth.com/red-gemstones/ describe the slight presence or hue of another color. The main colors of ruby are red, light orange, strong orange, light purple, and strong purple. And saturation (also called purity or intensity) describes how well a gemstone is saturated with red and how freely it is brown or gray.
Unlike diamonds with a different classification system, rubies do not have a suitable method of characterizing their color. This is due to the extreme range of tones, hues, and saturation of rubies.
The best color evaluation is based on the "seeing eye". Most people believe that rubies from mines in Burma are the largest ruby color. These rubies are known as Burmese rubies or "pigeon blood" rubies.
The best ruby cuts offer a higher depth/width ratio than comparable diamond cuts. This cut is 65% – 80% for quality rubies. If the ruby is cut too deep, the stone will appear smaller than it is but will show more color than the cut in normal proportions.
These deep cut stones also maintain their weight and add to the price of the stone. A stone that is too flat will appear heavier, appear larger, and appear lighter. It's hard to find perfectly cut rubies anywhere.