Making sure your ring fits is a crucial part of the ring shopping process. All Patrick Adair Designs Rings are sized in US sizes. If you are unsure of your ring size, select the "Unsure - Send Ring Sizer First" size option and we will send you a ring sizer before making your ring. Due to the scarcity of meteorite, we are unable to offer a free size exchange for any of our meteorite rings. Because of this, we highly recommend you confirm your ring size before purchasing via our PAD Ring Sizer. In the event you need a size exchange, please email us and we will be able to exchange your ring to a new size for a materials fee.