The ronde solo preserves the perfectly pitched classical elegance and signature cartier features of the ronde de cartier watch that serves as its inspiration roman numerals blue sword shaped hands winding mechanism crowned with a sapphire and rail track minute circlesteel case steel circular grained crown set with a spinel cabochon sapphire crystal silver opaline dial roman and arabic numerals sword shaped blued steel hands round scales alligator skin strap steel double adjustable de