Assertion: pink tourmaline | /r/HasProperty | rare
Facets:
value: very
type: DEGREE
value: in itself
type: LOCATION
Source sentences:
text: While not as rare as its sister the Paraiba tourmaline, pink tourmalines are still incredibly rare.
text: Pink tourmaline is still the most sought-after variety of tourmaline, which in itself is a very rare mineral, thus making the market for it much more competitive.