Pink sapphires range from red to purple with weak to vivid color saturation and lighter tone. Purple sapphires are similar in color but darker and always have purple as the dominant color. They range from medium to dark reddish purple to violetish purple with weak to vivid color saturation Corundum appears in an array of yellow and orange hues that includes bright lemon, soft peach, and vivid tangerine.
In specific color terms, yellow sapphires range from light to dark greenish yellow to orangy yellow with weak to intense color saturation. The finest yellow sapphire is yellow to orangy yellow with vivid saturation.
Orange sapphires range from yellowish orange to reddish orange. The finest orange sapphires are strong, pure orange to red-orange with medium tone and vivid saturation.
Green sapphires range from light to dark bluish green through yellowish green, and are usually low in saturation. Green sapphire is readily available, but its color isn’t very marketable. Its color is sometimes described as khaki or olive. That’s because the stones tend to have low saturation or unattractive color zoning.
People in the trade refer to corundum in its purest form as either colorless sapphire or white sapphire. The closer corundum comes to having no color, the more valuable it is as a colorless sapphire. Traces of extremely light gray, yellow, brown, and blue are common, and reduce the value. Colorless sapphires have been popular as small accent stones in jewelry.