I may be wrong but if I recall, the silmarils are described somewhere in HoME as "cabochons". Cabochons are typically oval shaped, somewhat flat on one side and rounded on the other, either faceted or not. However, in Flight of the Noldoli (Lays of Beleriand), they are described as globes. Hard to set in a piece of jewelry.
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Beleriand, Beleriand,
the borders of the Elven-land.
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