Having multiple flat surfaces or sides, like a gem that has been cut with many faces.
From French 'facette' (small face), diminutive of 'face.' The word evolved from Latin 'facies' meaning face or appearance. The -ed ending indicates a completed action or state of having been cut into facets.
Facetted diamonds sparkle because each flat surface bounces light at different angles—the more facets, the more brilliance! This is why diamonds cut with 58 facets (the standard brilliant cut) shimmer more than rough stones.
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