Assertion: opal's body color | /r/HasProperty | black
Facets:
Source sentences:
text: Black opals have a black body color with fire, which is often spectacular against a dark background.
text: Black opal, regarded as king of the opal world, has a blue, gray or black body color that reveals a more dramatic play of color.
text: Black opal, regarded as king of the opal world, has a blue, gray or black body color that reveals a more dramatic play of color.