Assertion: alexandrite | /r/HasProperty | hard gem
Facets:
value: with a high refractive index
type: OTHER
value: very
type: DEGREE
Source sentences:
text: Alexandrite is a very hard gem with a high refractive index, so it takes a fine polish and can be very sparkly.
text: Alexandrites are a hard and durable stone, and so they are ideal for any jewelry design such as rings, earrings, pendants, brooches, pins and pendants.
text: Alexandrite is one of the hardest stones, rating 8.5 on the MOHS scale which means that the only two stones harder than alexandrite are corundum and diamond!