Assertion: violet's color | /r/HasProperty | produced
Facets:
value: almost always
type: DEGREE
Source sentences:
text: Today, nearly all of the gems being sold as "tanzanite" have a blue color that has been produced or enhanced by heating.
text: The color of commercial stones is almost always produced or enhanced by heating brown or green zoisite.
text: Depending on the frequency of the light, different colors are produced.