Assertion: ounce | /r/ObjectUse | used for measurements of gems
Facets:
Source sentences:
text: The troy pound is no longer in general use or a legal unit for trade (it was abolished in the United Kingdom on 6 January 1879 by the Weights and Measures Act of 1878), but the troy ounce, ​1⁄ 12 of a troy pound, is still used for measurements of gems such as opals, and precious metals such as silver, platinum and particularly gold.