Assertion: red tourmaline | /r/HasProperty | rare
Facets:
value: to see a tricolor
type: PURPOSE
Source sentences:
text: Red tourmalines, especially ones that resemble fine ruby, are so rare that they are almost never seen in jewelry stores, and remain essentially unknown to the public.
text: It is rare to see a tricolor, though bicolors are more common; less common when clean and in a decent size like this.
text: Yellow tourmaline is rare.