Lee's Crystal

One side was rough and rocky, like it'd just been hewn from the ground. The other side however was a beautiful crystal of yellow. The whole thing could only have been about the size of an eye, and about the shape too. I think it's a topaz. Or... maybe a yellow diamond? I'm not sure.
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Oh, what's this? An extra part of a reference sheet that's being uploaded? What could this be for?

Thank you for MekanikalTrifle for help with development and description.