About: http://webisa.webdatacommons.org/321014485

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	With a hardness of 7 ??? 7.5, tourmaline is a tough and durable gemstone suitable for any kind of jewelry.
http://www.w3.org/ns/prov#wasQuotedFrom	multicolour.com