i got 10 Gemstones but now what

i finally collected 10 Gemstones but i have no idea what to do with them. I find all Hextech skins Ugly. i dont play vayne or hecarim or darius whatever. the Only skin i ever wanted was Neo pax sivir and that one is currently unavaiable. Does anyone know something about a return of Neo pax sivir. if it wont return then ill waste my gemstones on chests otherwise i will wait for neo pax sivir to return.
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