Treatment of Royal blue sapphire is acceptable only for no treatment or traditional heating. Royal blue sapphires should not show significant windowing (transparent area) and/or extinction when viewed face up. Royal blue sapphires should have excellent to good proportions to maximise total internal reflection. The colour uniformity must be excellent or evenly distributed.Ĭut plays a very important role in the colour of a sapphire. Royal blue sapphire must be flawless, preferably clean to the eye, or at least transparent, without pronounced inclusions that are very visible under the table. For more information on colour classification, see here.Ĭlarity has a very important influence on the value of a sapphire. Royal blue describes sapphires with a pure blue to very slightly violetish blue hue, with a vivid saturation, which can in rare cases range from intense to deep, the tones should be medium to medium dark. Colour has the greatest influence on the value of a sapphire.
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