Assertion: alexandrite | /r/HasProperty | discovered in 19th century
Facets:
value: mostly
type: DEGREE
Source sentences:
text: Alexandrite is pretty rare gemstone mostly because it was discovered in 19th century.
text: In the history of gemstones, this one is relatively young having been discovered in the 19th century.
text: First discovered in Russia in the 19th century, alexandrite was named after the future Czar Alexander II.