Board Thread:General Discussion/@comment-26408694-20141004142023/@comment-4536113-20141004155443

I've heard another theory that a Gem's gem can either grant their user the power to use weapons and elements (which might explain Lapis' ability to control water, and how we haven't seen her summon a weapon) and Garnet has two because she can summon both weapons and can use eletricity (as seen in Arcade Mania when she summoned eletricity to turn the Meat Beat Mania game back on.)