What is "zircons"

Usage examples of "zircons".

They brought in agate and quartz, feldspar and rock crystal, jasper and zircons, and once in a while a diamond.

He hopped in to grab zircons he thought was diamonds, an' there wasn't any steps like a swimmin'-pool should have, an' he couldn't get out again.

Alma flashed and twinkled in so many zircons that he wished he had dark glasses on.

Since yesterday afternoon it had seemed more like the glitter of zircons, near-perfect.