These Indian Gypsy Style earrings are made by the artisan of Jaipur in India. They are made of brass (an alloy of copper and zinc) with the stones in the center and the stones hanging on the edges.
 
Brass is a good alternative to gold, it doesnt change color or break down over time. It does not cause allergies, so you can wear it without fear.

It is also very easy to clean by rubbing it with a little toothpaste or soap and lemon juice.