Single crystals of ice are grown from vapor, and viewed by means of an interference microscope. The basal facet persists until melting, but the prism facet disappears above about -2-degrees-C, the surface taking a dome shape. With the temperature dropping from near 0-degrees-C, a facet reappears at -1.35-degrees-C. The measured curvature just above the transition is consistent with the prediction of a "universal curvature jump" by Jayaprakash, Saam, and Teitel. The surface curvature near the facet edge is also measured.