Assertion: paraiba tourmaline | /r/AtLocation | the gemstone world
Facets:
value: at the annual tucson gem show
type: TEMPORAL
value: in early 1990
type: TEMPORAL
Source sentences:
text: The Paraiba tourmaline was first introduced to the gemstone world at the annual Tucson gem show in early 1990.
text: The Paraiba tourmaline was first introduced to the gemstone world at the annual Tucson gem show in early 1990.