Assertion: paraiba tourmaline | /r/HasProperty | precious stones
Facets:
Source sentences:
text: Tourmaline is a gemstone noted for the large and unsurpassed range of colors in which it occurs, and Paraiba tourmalines are precious stones displaying a uniqueness and splendor of those colors.
text: 14 Hi quality Paraiba tourmaline is too expensive to be called semi precious.