  Statefinder diagnostic is a useful method which can differ one dark energy
model from each others. In this letter, we apply this method to a holographic
dark energy model from Ricci scalar curvature, called the Ricci dark energy
model(RDE). We plot the evolutionary trajectories of this model in the
statefinder parameter-planes, and it is found that the parameter of this model
plays a significant role from the statefinder viewpoint. In a very special
case, the statefinder diagnostic fails to discriminate LCDM and RDE models,
thus we apply a new diagnostic called the Om diagnostic proposed recently to
this model in this case in Appendix A and it works well.
