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Looking for help regarding directional properties of a gemstone

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Hi there

I am desperately looking for some help please.

I need to write about 20 different gemstones. I have to talk about their physical properties relating to the following: Colour, Opacity, Moh's scale of hardness, Directional Properties and Elements of risk.

The colour part, Moh's scale etc is fine but i don't really know what to write about the Directional properties and elements of risk. I have spent 3 weeks trying to find a site where it explains this in terms i can understamd (i'm new to this) and it just goes straight over my head.

Would someone please be able to give me an example for say a sapphire or Jadeite so i know where to look or if i'm on the right track with things.

I am so confused over all of this.

Many thanks Mhairi

asked Sep 14, 2013 by marsbar31 (120 points)

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