Facet

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Glossary Term

Facet

Diaspore · Zultanite
Fact-checked 2026-04-27

Pronunciation
FAS-it

A flat polished surface on a cut gemstone, geometrically arranged to maximize light return and color display. Color-change diaspore is typically faceted in oval, cushion, pear, or emerald cuts oriented so the table maximizes the daylight-to-candlelight color shift while minimizing exposure of the {010} cleavage plane.