Assertion: silicon carbide | /r/HasProperty | synthetic
Facets:
value: as a gemstone
type: MANNER
Source sentences:
text: Virtually all the silicon carbide sold in the world, including moissanite jewels, is synthetic.
text: As a gemstone used in jewelry, silicon carbide is called "synthetic moissanite" or just "moissanite" after the mineral name.
text: Because natural moissanite is extremely scarce, most silicon carbide is synthetic.