Blue sapphires are evaluated based upon the purity of their primary hue. purple, violet, and green
are the most common secondary hues found in blue sapphires. Violet and
purple can contribute to the overall beauty of the color, while green is
considered to be distinctly negative. Blue sapphires with up to 15%
violet or purple are generally said to be of fine quality. Blue
sapphires with any amount of green as a secondary hue are not considered
to be fine quality. Gray is the normal saturation modifier or mask
found in blue sapphires. Gray reduces the saturation or brightness of
the hue and therefore, has a distinctly negative effect.
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