Sapphire gemstones come in all colors of the rainbow except red color.
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The International Gem Society (IGS) has a list of businesses offering gemstone appraisal services.
Color is the most important element in estimating the value of blue sapphire. Although hue counts, the closer to a pure blue the better, saturation is more important. Top sapphires reach vivid saturation. (Many sapphires on the market are actually grayish). Tone is also an important consideration. Dark sapphires are abundant and never reach very high values. (Of course, the same can be said for all dark gems: too dark and they’ll only be moderately valuable). The pictures below are a rough illustration of differences in blue sapphire saturation.