Assertion: topaz | /r/HasProperty | rare
Facets:
value: very
type: DEGREE
value: as in the 1700s
type: TEMPORAL
Source sentences:
text: Topaz with a natural blue color is very rare and valuable.
text: Topaz is a rare silicate mineral with a chemical composition of Al 2 SiO 4 (F,OH) 2 .
text: topaz with a natural blue color is very rare.
text: Another topaz that is rare is the green topaz, and is highly valued also.
text: Today, as in the 1700s, topaz with this red, pink, or orangy yellow color component is rare and very valuable.