About: http://webisa.webdatacommons.org/213249159

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	Light that travels from a gemstone into an optically rarer (or less dense) medium such as air will bend away from the normal.
http://www.w3.org/ns/prov#wasQuotedFrom	gemologyproject.com