![]() ![]() Picture 1.1.1 Different colors in natural corundum The red corundum with a color tone of over 5 is called ruby, and corundum of all other colors – sapphire (white sapphire, yellow sapphire, orange sapphire, pink sapphire, blue sapphire, green sapphire, etc.). Saturation refers to the intensity of color and is the degree to which color departs from a neutral (gray) sensation. The tone scale is divided into 11 grades, 0 to 10, with 10 being black. Natural corundum can be found in all colors in nature with a wide variety of hue, tone, and saturation (according to the GIA grading system for colored gemstones) (picture 1.1.1). The color is determined with hue precision, for example, red-violet, violet, violet-blue, etc. Tone refers to a gem’s relative lightness or darkness of color, for example extremely light, very light, light. 1.1 Color, tone, and hue in natural corundum.
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