Assertion: zircon | /r/HasProperty | popular gemstone
Facets:
Source sentences:
text: Zircon is a popular gemstone that has been used for nearly 2000 years.
text: Zircon is a popular gemstone because it is available in a variety of colours and colourless, faceted zircons have been used as a substitute for diamonds.
text: Zircon is a popular gemstone that has been used for nearly 2000 years.