For each Trisomy 18 Awareness bracelet sold, Essential Jewels will donate 10% of the purchase price to the The Arc Bracelet is made with 8mm AAA grade natural Aquamarine and White Jade stones. Available in several sizes. To determine your size, measure your wrist with a fabric tape measure If you want a size that is not listed, please reach out to me, I will gladly make whatever size you request.