Sapphire - Tanzania 6.73 cts - Ref. OSB/52- THIS STONE HAS BEEN RESERVED
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Sapphire - Tanzania 6.73 cts - Ref. OSB/52- THIS STONE HAS BEEN RESERVED

$323.00
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Sapphire - Tanzania 6.73 cts - Ref. OSB/52- THIS STONE HAS BEEN RESERVEDNote: Colour change is from a  strong blue-purple in daylight to a strong purple-pink in incandescent light. Note the two photos showing the colour changeGraded AA+ and weighing 6.73 cts.Priced at just $48.00 per carat, a total of $323.00Now beat that for valueA typical Umba Sapphire from Tanzania. These stones are unique in the range of colours shown, usually in the blue to purple range sometimes pink and green. The Sapphires not only show a strong dichroism - that is, they show two distinct colours - many, but not all, of the Umba Sapphires also show a strong to medium 'colour-change' depending whether they are observed in daylight or incandescent light. It is this phenomena which makes they extremely difficult to photograph as usually the camera picks up the color-change in incandescent light. 

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