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A diamond that is cut in a modification of the brilliant cut, so that the girdle is boat-shaped (elliptical and pointed at both ends), with a hexagonal table, surrounded on the crown by 32 trapezium-shaped and triangular facets. The pavilion has 24 facets (as on the pavilion of a pendeloque cut stone) and a culet. It is sometimes called a 'navette'.
From: An Illustrated Dictionary of Jewelry, autor: Harold Newman, publishers: Thames and Hudson