I was super low on gems from trying (unsuccessfully) for the new Mythic (I know it’s not great, but I’d rather spend gems than have to remember to craft it later), so I tried running my gems to 0 and switching PvP zones just for fun. Was hoping it might glitch out and give me negative gems or flip over to the integer limit or something, but no such luck. Just kept me at 0 gems. Shame!