Assertion: emerald | /r/HasProperty | a may birthstone
Facets:
Source sentences:
text: Emerald is a May birthstone.
text: Emeralds are the Birthstone of May and the Anniversary Stone for the 20th and 25th year!
text: Not only are these emeralds considered as the May birthstone, but they are also used as a traditional gift for 20th or 35th anniversary