New answers tagged crystals
I don't know if this answers your question. Have you seen how a cube of ice melts? Focus on one corner and you will see the melting happening on the edges. This is precisely the limit shape that you get from the domino tiling of a hexagon (which can be mapped to the dimer problem). This is called the Wulff shape of a crystal. See also the (theoretical) ...
Natural diamonds are slightly harder than synthetic diamonds. This is very commonly known in manufacturing (diamond-tipped drills etc) and there is plenty of engineering resources on the subject. However for jewelry purposes, a trained jeweler can almost never pick out a real vs synthetic without special tools for that purpose.
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