Assertion: opal | /r/HasProperty | referred
Facets:
Source sentences:
text: Opals, those untreated other than than cutting and polishing are referred to as natural, while treated/modified Opals are refered to as 'man-made'.
text: Regardless of cutting and polishing processes; the opals born by mother of nature are referred to as “Natural Opal” while treated/modified ones are referred to as