Assertion: oyster's pearl | /r/HasProperty | white
Facets:
Source sentences:
text: Most people think that pearls are round and white; however natural pearls can be colored yellow, rose or even black.
text: Pearls may be a variety of colors, including white, pink, and black.
text: If an oyster that typically produces white pearls has an unusual black coloring in its nacre, it too can create a blackish pearl.