PUBLIC SERVICE ANNOUNCEMENT: PEOPLE! THE GEMS CANNOT BE PLACED ON THE PEDESTAL AS OF FEBRUARY 7, 2018.
In a very recent update, Prodigy has released the Shipwreck Gem. You must complete the quests from Shipwreck Shore to receive the gem.
A new gem might be released this year (probably of the Astral typing), as Swoopy from The Lost Island says "Collect as much wood as you can before you real journey begins later this year". There has also been a conformation of a new gem from Van in the prodigy zendesk. Here is the photo: