Some sapphires have this ability usually a bluish color in daylight to a reddish color under electric lights. Sapphires are no different but it is the blues that are valued more than other colors and a blue which can be described as Cornflower blue or sometimes Kashmir Blue is the best.Ī rare phenomenon in the world of gems is the ability to change color when viewed under different types of light. A nice even color throughout the gemstone is very much desired with a deep color tone without it being too dark for the color to be appreciated. All other factors being equal, pretty much all colored gemstones are valued on their color, a combination of hue, tone and saturation.
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