Thinking about my character and wanted some clarification on Gems.  Each one has an associated weapon, but does each one have a specific power?  For example, Garnet has Future-Vision, Lapis Lazuli seems to be able to control water, and...what else?  I am unsure if Peridot's 'abilities' are part of her nature, or just gem technology that she uses.  Amethyst transforms a lot, but it is explained that all gems can transform anyways, and Pearl seems to be able to make projections (and murderous robot clones).  Steven can create force fields in addition to his weapon being a shield, and has the ability to heal gems.

So I guess my question is, should I come up with an ability for my gem, or is that not something every gem has?

EDIT: I will most likely pick Amber.