Can you clarify what you mean by glitter gel? Glitter liner? What do you want it for, lining, as a shadow, pigment… Graftobian has a nice sparkly one. Glitter is super finnicky in general, it’s so important to have a good base for it to adhere to. So I’ll talk about that specifically.
I am super fond of Too Faced Shadow Insurance Glitter Glue, it’s very tacky and glitter sticks to it so well, compared to clear gel based glitter primers. For TFSI GG you PAT the glitter on, don’t brush it on (I mean brushing on glitter is a terrible idea anyway). Also, when applying glitter or pigment in general, it’s a good idea to cover the rest of your face or at least the cheek area with a little bit of tissue paper to catch any fallout or glitter so you don’t ruin any makeup you’ve already applied.
So far I haven’t found any glitter liner that I like enough to recommend, whenever I use glitter in makeup, it’s usually a glitter from Naked Cosmetics (I have QUITE a few!).