Question: what is the best rare gem in bejeweled blitz?
Answer: Moonstone. The Moonstone splinters into three fragments and lands in your game board as a trio of Star Gems to start you off. ... 
Cat's Eye. ... 
Phoenix Prism. ... 
Blazing Steed. ... 
Kanga Ruby. ... 
The Rare Gem Vault. ... 
I bought a Rare Gem but I didn't get to use it; what happened?