Assertion: triplet opal | /r/HasAspect | artificial appearance
Facets:
Source sentences:
text: Triplet opals tend to have a more artificial appearance and are not classed as precious gemstones.
text: Triplet opals therefore have a more artificial appearance, and are not classed as precious opal.
text: Triplet opals therefore have a more artificial appearance, and are not classed as precious opal.