okay let me establish a few things, your power/energy what ever you wish to call it is NOT solely dependent on an element. finding an element to work with is basic in magick cause the elements penetrate the vary core of energy work and it will be easier for to work with "familiar energy" hence we say find your element.
as for amulets, they will only contain what you give them, what i can do is give you a few stones related to working on your chakras
Earth based stones, root chakra work
Black and snowflake obsidian
Water element qualities
The rest are found here http://www.rainbowcrystal.com/crystal/chakra.html