A
cutting tool (1; 101) comprising: a base element (10; 110),
a diamond layer (11; 111) arranged on the base element (10; 110), and a first surface (8; 108), a second surface (9; 109) and a
cutting edge (4, 5; 105) which is arranged at least in part of a
ridge line at which the first surface (8; 108) intersects the second surface (9; 109), wherein the
diamond layer (11; 111) is arranged in at least a part of the first surface (8; 108), at least a part of the second surface (9; 109) and at least a part of the
cutting edge (4, 5; 105) and a maximum height in the cutting edge (4, 5; 105) is smaller than a maximum height in the first surface (8; 108) and the maximum height in the cutting edge (4, 5; 105) is greater than a maximum height in the second surface (9; 109), wherein in the cutting edge (4, 5; 105) the maximum height is 0.3 to 0.7 µm and an arithmetic mean roughness is 0.06 to 0.1 µm, in the first surface (8; 108) the maximum height is 0.8 to 1.4 µm and an arithmetic mean roughness is 0.1 to 0.25 µm and in the second surface (9; 109) the maximum height is 0.1 to 0.5 µm and an arithmetic mean roughness is 0.04 to 0.08 µm, wherein the cutting edge (4, 5; 105) has a convex-curved
surface shape in a cross-section orthogonal to the
ridge line, and the cutting edge (4, 5; 105) has a plurality of grooves (13) in a direction which intersects the
ridge line, and wherein the plurality of grooves (13) are orthogonal to the ridge line.