Assertion: opal | /r/CapableOf | display play of color
Facets:
Source sentences:
text: Opals displaying play of color are known as precious opals, and opals lacking play of color are known as common opals.
text: The silica spheres must be perfectly lined up and stacked in an orderly way for opal to show play of color.
text: Any other opal showing a play of color, but which is not equal in grade (color in intensity and purity) to the tops, is "noble opal".
text: Any Opal exhibiting a play of colour.
text: So, once Opal stored too arid or exposed with heat over a long period of time, Opals will display cracks and its play of color become soft.
text: Opals displaying play of color are known as, and opals lacking play of color are known as.