Assertion: emerald | /r/HasProperty | hard
Facets:
value: relatively
type: DEGREE
value: on the mohs scale
type: OTHER
Source sentences:
text: Emeralds are relatively hard (7.5-8.0 on the Mohs scale), but since most natural stones of this kind usually have a lot of internal imperfections, they are easy to break if hit.
text: Emeralds are relatively hard gemstones and whereas glass and other weak materials used in fake gemstones wear down quickly, emeralds will retain sharp clean edges on the facets.
text: Although emerald is one of the harder gemstones, it does still require careful handling, due to its naturally included and flawed formation.