Cutting insert

A cutting insert for turning comprising an upper surface, a bottom surface substantially parallel with said upper surface, and at least three side surfaces extending between said upper and bottom surfaces, a transition between two adjacent side surfaces forming a rounded nose radius surface, and an intersection of said upper surface and said nose radius surface forming a nose cutting edge, said nose cutting edge comprises at least five circle segments arranged in succession between adjacent side surfaces and together forming a smoothly curved nose cutting edge, with successive circle segments having different radii of curvature, wherein said at least five circle segments comprise a first segment intersected by an imaginary bisector of said nose radius corner and having a first radius of curvature, second and third segments located at respective sides of said first segment and having equal second and third radii of curvature, respectively, and fourth and fifth segments located at sides of respective ones of said second and third segments and having equal fourth and fifth radii of curvature, respectively, wherein each of said equal fourth and fifth radii of curvature is larger than said first radius of curvature, and said first radius of curvature is larger than each of said equal second and third radii of curvature.