Assertion: stone | /r/HasProperty | hard
Facets:
value: very
type: DEGREE
Source sentences:
text: Most gemstones are hard, but some soft minerals are used in jewelry because of their luster or other physical properties that have aesthetic value.
text: As a result the stone is very hard and can readily be polished to a smooth surface.
text: Most gemstones are hard, but some soft minerals are used in jewelry because of their lustre or other physical properties that have aesthetic value.