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What gem is dark/black when looked at normally, but dark red when light is shone upon it?

I had a necklace once that was like this, but I don't know what it was. Help?

(Wasn't entirely sure where to put this...)

1 Answer

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  • Anonymous
    1 decade ago
    Favorite Answer

    Some varieties of garnet have this colour.

    www.stonesandfindings.com

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