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(Newbie) Help needed to appraise tourmaline crystals

kurutoga

Rough_Rock
Trade
Joined
May 2, 2014
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2
Trying to figure out the value of a few tourmaline crystals. The color is nice but not true blue. Crystals are generally clean but not flawless. Size is around 20-30mm and weight around 5-8 grams. How do you think of $40 per gram?

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Is this being asked because you want to get it faceted, or because you want a nice mineral sample?
 
Initially I had a few collectors looked at them but they dislike the crystals due to the scratches on the outside.

So I am moving on to faceting. I was told the final stone usually have a yield of 20% in weight. If I consider $100 per carat and labor cost I thought I can only barely make it even - if the crystal costs $40 per gram. Are these reasonable estimates? Apparently the selling price of the stones are related to the color but that color is not entirely pure blue. So I have to discount the selling price. Thanks a lot.
 
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