Glossary Term
By Marcus Whitlock, GG, FGA Lapidary & Cutting Editor
The lower portion of a faceted gemstone, below the girdle. Pavilion facets reflect light back through the table to produce brilliance. Diaspore’s strong birefringence (~0.048) makes pavilion facet edges visibly doubled when viewed through the table — a diagnostic feature distinguishing it from singly-refractive simulants.
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