A trigon's presence on a diamond most directly indicates the presence of which crystal plane?

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Multiple Choice

A trigon's presence on a diamond most directly indicates the presence of which crystal plane?

Explanation:
A trigon points to the octahedral plane orientation in diamond. In diamond’s crystal system, the octahedral faces are triangular, coming from the {111} planes. A small triangular feature like a trigon forms on those octahedral faces, so its presence directly indicates octahedral planes are exposed. The other plane types (cubic, dodecahedral, or tetrahedral) correspond to different crystal faces and would not be indicated by trigons.

A trigon points to the octahedral plane orientation in diamond. In diamond’s crystal system, the octahedral faces are triangular, coming from the {111} planes. A small triangular feature like a trigon forms on those octahedral faces, so its presence directly indicates octahedral planes are exposed. The other plane types (cubic, dodecahedral, or tetrahedral) correspond to different crystal faces and would not be indicated by trigons.

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