Assertion: tourmaline | /r/HasProperty | cleaned
Facets:
value: typically
type: DEGREE
value: very
type: DEGREE
Source sentences:
text: There is a downside to this magnetic quality though, as tourmaline, more than any other gem, attracts dust to itself while it is kept in display cases and thus needs to be cleaned more often than any other gem.
text: Tourmaline is typically a very clean gem, so eye clean stones are expected.