It is difficult to cut due to its cleavage properties, a quality or custom cut kyanite gemstone will fetch a much higher price.
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You could be right, but for many of the lesser known and less rare (compared to tsavorite and the big three) species, the price per carat does not increase over ten carats. I see a 10 ct kyanite or two for about $85/ct for sale on the internet, so at that per carat price, it would be about $. Then as far as value is concerned, are you talking replacement value (retail) or what you could get for it. Generally everybody but a jeweler is buying retail and selling wholesale. That said, I can&#;t say for sure that your valuation with escalating per carat price is not right for kyanite, so maybe.
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Certainly a very pretty stone for a pendant. Hardness of kyanite is directional and 4 to 4.5 along the long axis of the crystal and 6 to 7 perpendicular. Easily scratched.
Congrats on a nice find, tho&#;.
royjohn
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