This flower of life ring is made by the artisan of Jaipur in India. It is made of brass (an alloy of copper and zinc).

Brass is a good alternative to gold, it does not 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 and lemon juice.
Signification:
Flower of life: Serenity, Meditation, Harmony, Calm.