Assertion: opal's inclusion | /r/CapableOf | reflect thin band of light
Facets:
value: less commonly
type: DEGREE
Source sentences:
text: A rare, but popular, variety of Moonstone, is the Cat's Eye or Star Moonstones where inclusions within the gemstone reflect a thin band of light resembling the eye of a cat or, less commonly, a star of 4 or 6 or even more rays.