Do you need the same type of gem to upgrade your gems? Or do fragments and other Legendary gem types work?

For my 1 star gems, I've found that extra gems that are a different type are usable as upgrades. However, I haven't gotten any higher star gems, and I've only upgraded them to level 2.

This post was edited by eric1014153 on Jun 5 2022 03:38pm

You use fragments to upgrade, but you can only equip one of each. So the other can be destroyed and then used as fragments

I guess my question is more of can I randomly craft a bunch of junk gems instead of having to be choosy about what I need in order to fully upgrade the equipped ones?

This post was edited by eric1014153 on Jun 5 2022 04:08pm

I guess you can