Assertion: alexandrite | /r/PartOf | chrysoberyl family of gems
Facets:
Source sentences:
text: Alexandrite belongs to the chrysoberyl family of gems, of which there are three varieties: the typical chrysoberyl usually seen in shades of yellow to light green; cymophane which is commonly known as cat’s eye; and alexandrite which is the only one of the family that exhibits a definite color change.