Assertion: chalcedony's color | /r/HasProperty | dyed black
Facets:
Source sentences:
text: But -- unfortunately, widespread marketplace bastardization of the term has led to current, almost universal application of onyx to only the black portion of onyx per se ; and, even more unfortunately, much of the material called onyx in the market place is chalcedony of some other original color that has been dyed black.