Assertion: opal's property | /r/HasProperty | negative
Facets:
Source sentences:
text: These properties can be positive or negative or a mixture of both, in that sometimes a particular type of jewel (or valuable substance we regard as being in the same class as gemstones, such as pearl and coral) can contain both good and bad elements.
text: These properties can be positive or negative or a mixture of both, in that sometimes a particular type of jewel (or valuable substance we regard as being in the same class as gemstones, such as pearl and coral) can contain both good and bad elements.