That could be needed for laser weapons! Sorry, but unreleased content like this just makes speculation happen.
Zynga
may soon release a new resource, Gems, to
Empires & Allies. That's at least what they're rumored to be on
Empires & Allies Base. The jewels come in Topaz, Emerald, Sapphire, Ruby and Diamond. Hm, that's the same amount of colors as there are Ore varieties in the game. However, we still wonder what they're purpose is. Our bet is still
clinging for dear hope on laser weapons.