CosmosCosmos is comprised of fragments of authentic Muonionalusta meteorite and crushed opal stone, inlaid into a durable polished tungsten carbide inner ring. Since every meteorite fragment displays unique patterns, your ring will truly be one of a kind. We use US standard ring sizes. To find your perfect fit, please refer to our sizing guide below. However, we always recommend verifying your US ring size with a jeweller for meteorite rings which cannot be