Assertion: opal's value | /r/HasProperty | the black opal
Facets:
Source sentences:
text: The most valued of all opals is the Black Opal, of which Lightning Ridge is ’home’ and their inherent value comes from their rarity.
text: The most valued of all opals is the Black Opal, of which Lightning Ridge is the “home” and their inherent value comes from their rarity.