Assertion: opal | /r/HasProperty | treated
Facets:
value: occasionally
type: DEGREE
Source sentences:
text: Can opals be treated?
text: Opal is a soft stone and therefor is occasionally treated or impregnated with colorless oils, plastic, resin or wax which act as a bonding agent, reduce the visibility of the inclusions and improve the overall clarity of the stones.
text: At one time this opal was in demand but at the present time the opal mined in this area has to be treated to enhance its' appearance.
text: When you view my Lightning Ridge Collection, you can be sure the opals are natural, non-treated, ethically mined and sourced from Lightning Ridge, Australia.