Assertion: alexandrite's rarity | /r/CapableOf | increase at the ½ct and 1ct mark
Facets:
value: exponentially
type: MANNER
Source sentences:
text: Any stone over ¼ct is considered a solitaire size, the rarity increases exponentially at the ½ct and 1ct mark, and fine stones over 2cts are so rare we have never sold one!