A thumb ring construction for use as ornamentation on a hand including a support base member on which a decorative gem can be disposed and a ring shank attached to the support base where the ring shank has undulations with respect to a vertical transverse plane. The ring shank and base member define an opening and a central axis through the center of the opening. The mid or side portions of the ring shank are inclined relative to the central axis to enhance the fit of the ring shank to a thumb and to provide rotational stability of the ring when worn on a thumb.