It has recently been shown that the in‐plane acceleration sensitivity of contoured quartz resonators vanishes for a perfectly symmetric combined resonator plus support system. This indicates that a biconvex resonator will have lower resultant in‐plane acceleration sensitivity than a plano‐convex one because of its inherent additional symmetry. Since a plano‐convex resonator is easier to fabricate, an analysis of the degradation in the in‐plane acceleration sensitivity that arises from the contour being on one side only is performed. The calculations show that the in‐plane sensitivity of the plano‐convex resonator increases with decreasing radius of curvature and that the magnitude ranges over a few parts in 1012per g.