(It’s “zircon” [which, unlike cubic zirconia, is found in nature].)
[A] pearl can cause a baby to be born sooner… women wear a ruby
against their skin to prevent miscarriages, if I’m not mistaken, and these
things have their source in Gemorrah and are NOT pagan.
I’d like a source for that pearl business – Google isn’t showing me anything
like that (not that that’s conclusive evidence). The even tekumah is
in the Gemara. It seems to be identified by different sources as ruby, carnelian,
and aetite (also known as eaglestone).
I don’t think the concept of stones having powers is a pagan one.