When you click on the mosters, you should get two tabs on the bottom of the screen. On some, they will be grayed out. When they are not, clicking on the tabs will give the possible gem upgrades you can use on them.
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If you can be sad, you can be glad, and that's how I chose to be. - Winter D.P.
Queen of Winter and Coqueen of DRAGONS!
I HAVE RETURNED FROM THE NETHER EXISTENCE! Greetings. <(^_^<)