facet
/ˈfæsɪt/noun
One of the small flat polished surfaces on a cut gemstone.
Example sentences
- “Light sparkled off every facet of the ruby.”
- “The jeweler polished each facet of the stone by hand.”
The figurative use is now the common one: a facet of a problem or personality is one side of it. 'Multifaceted' means having many such sides.