Assertion: opal | /r/HasProperty | official birthstone
Facets:
value: for october
type: TEMPORAL
Source sentences:
text: Opal is also the official birthstone for October and those who wear opal can benefit from its many astrological powers.
text: The alternative October birthstone is Pink Tourmaline and in fact both Opal and Tourmaline are the official birthstones for this month.