Assertion: cameo glass | /r/HasProperty | rare
Facets:
value: extremely
type: DEGREE
Source sentences:
text: Roman cameo glass is fragile, and thus extremely rare—much more so than natural gemstone cameos such as the Gemma Augustea and Gonzaga Cameo, which are among the largest examples of many hundreds (at least) of surviving classical cameos produced from the 3rd century BC onward.