An 81-year-old man complained with increasing dyspnoea and asthenia few months after a successful double mitral and tricuspid valvuloplasty intervention. The echocardiogram revealed a partial detachment of the mitral annuloplasty ring due to dehiscence determining a severe regurgitation. Curiously, at Color-Doppler analysis of mitral inflow, the prolapse of the detached ring produced a fascinating circular line inside the regurgitation signal, mimicking the shape of a gemstone ring. We described a case of a relatively uncommon cause of late mitral valvuloplasty failure characterized by a really unusual echocardiographic finding.