Yet another Meta Gem aura!
Many of the other Meta Gem WeakAuras have relied on hardcoding requirements and colors of every meta gem for an expansion (and some of the worse ones have been locale-specific). This one uses a two-step hidden tooltip scanner to locate and check the color of the Meta Gem text in your helm, so it should, in theory, work for all meta gems in all expansions that use them, without needing to hardcode any data.