

A thumbprint ring is a made-to-order band with a scanned print laser-cut into the metal, not a generic swirl pattern. US shops ask for an ink card or photo, then engrave sterling, 14k, or tungsten. Memorial bands may add inner text; most do not hold cremains. Ridge depth is only as good as the scan.
Ask how to capture the print and whether you get a proof, then confirm size because tungsten does not size up later.