Assertion: opal | /r/HasProperty | black
Facets:
value: completely
type: DEGREE
Source sentences:
text: Fact: If an opal was completely black, it would also be completely worthless.
text: We do not allow opals from Indonesia or Ethiopia to be called black opal, unless an approved gemmological laboratory issue certification.
text: A opal with N5 to N6 is considered semi black or dark opal.