Nightmare Tear

This matches any socket -- you should use it in a socket which gets you a socket bonus. Especially useful for restos, tanks, and DKs who primarily ignore the socket bonuses when gemming (usually socket bonus is negative compared to non-matching gem). Stick whatever you want in an eternal belt buckle, but not one of these.

As the item is not listed yet apparently, Here are the stats.

+10 to stats
Matches every colour.
Unique Equipped

Looks like it will be in high demand if it keeps the +10, putting it much more valuable than existing gems for many classes

Edit: Design is on the vendor for 3 Tokens
Edit: Prices changed when 3.2 went live, ALL jc designs are now 4 tokens each, taking this one up one token, and the other 72 designs down one token

You don't need a prismatic socket to use a prismatic gem, because it fits every slot. So you'd better to put it in a socket not very useful for you, for instance if you are a mage or a lock put it in a blue socket. The socket bonus will still be activated... and you can use the bucklet socket to add +23 sp with a runed cardinal.