Board Thread:General Discussion/@comment-4224349-20150305233453/@comment-26812261-20150306001724

Magnetin Darkwind wrote: So the Gems got to Earth roughly around 6000+ years ago, possibly earlier. That's roughtly before the Bronze age.

Considering architecture like the Sea Spire, which once accommodated gems on Earth, it's likely that gems were on the planet for quite some time before they decided to drink the Earth's milkshake.