Native American Baby Ring

Old Native American baby ring, of a silver metal unknown content, with a turquoise color stone, due to the small size very hard to tell if it is a real stone or not, but appears to be. First time we ever had a Native American ring this small, pretty metalwork around the stone. Ring is a size 1 & 3/4. No markings that we can find. It may be sterling, but we are pricing it as silver tone metal. This came to us from the estate of a trading post owner, had been stored away for years.