Assertion: onyx | /r/ObjectUse | used for cameo brooches
Facets:
value: during queen victoria's reign
type: TEMPORAL
Source sentences:
text: In ancient Rome, soldiers carried banded onyx engraved with images of their heroes for inspiration; during Queen Victoria's reign, onyx was used for cameo brooches; in the Art Deco period, onyx added contrast to ruby and quartz jewelry designs.