Assertion: emerald | /r/HasProperty | oiled
Facets:
Source sentences:
text: Infusing the stone with cedar oil is a very old treatment and is generally considered to be acceptable, as long as it is not concealed from the consumer (in fact, one can safely assume that any emerald seen in a jewelry store has been oiled, unless it is a very rare and expensive stone that has been certified by an independent gem lab).
text: While most emeralds are oiled to improve appearance, this process is considered a normal and acceptable practice.