What exactly is the "Moon Prism?"

Don't take this thread TOO seriously...A bit of randomness and boredom mixed together...and voila! :P

*ahem* So yes, folks -- just what exactly IS the Moon Prism?! After it got destroyed in the Classic season, it reappeared with Chibiusa in S. Is it just some cheap ol' hand-me-down of a henshin jewel? :x Or maybe there were just tons of moon prisms lying around and Neo-Queen Serenity just plopped one into a compact for Chibiusa and sent her off...! HMMMM.

....Yeaaah. Ok, not a whole lot to discuss, I know. Forgive me!