This was originally announced on our official Discord server.  In Ynami's own words:

Fun-Day Friday, May 23rd Edition!

 This week we've updated gem display cases to play nice again with most gems.  We've also put back a tier-shelved table in [Ratha Traders' Guild, Wholesale Outlet] to provide a source for these cases.  They should work to safely display on home surfaces, too, so you could hang one on a wall or set it on a table.

If you do fish out an old case from your vault and there's a gem stuck inside, please ASSIST.

Thanks to Javac for QCing as well.

Not a member of our Discord yet?  Join up!  The server is moderated and is a great way to stay in touch with fellow players and staff alike!  Our latest updates are posted there.  Access is tied to your in-game account and is setup in-game via the DISCORD verb.  F2P accounts are welcome, though they can only post in certain channels.