Assertion: chalcedony's color | /r/HasProperty | enhanced by heat treatment
Facets:
value: often
type: TEMPORAL
value: on the jewelry market
type: OTHER
Source sentences:
text: Colors can be enhanced by heat treatment or by dyeing other forms of chalcedony quartz so check wherever you may be buying your carnelian.
text: On the jewelry market, the color is often enhanced by heat treatment or dyes.