A high quality-factor electromechanical resonator that includes a tapered quartz crystal member having a first tapered portion, a second tapered portion, and an active portion between the first and second tapered portions, the active portion having a first edge portion and a second edge portion extending from the first tapered portion to the second tapered portion, each of the first and second portions being tapered along a longitudinal axis away from the active portion, a first electrode coupled to the first edge portion of the active portion and configured to apply a first voltage to the active portion, and a second electrode coupled to the second edge portion of the active portion and configured to apply a second voltage to the active portion, wherein the first and second electrodes are spaced apart along a lateral axis.