Polycrystalline diamond compact

A polycrystalline diamond compact, comprising:

• a cemented carbide substrate;
• and
• a polycrystalline diamond layer bonded to the cemented carbide substrate, the polycrystalline diamond layer consisting of a central part and an outer part;
• wherein:
• the cemented carbide substrate is cylindrical and comprises a circumferential wall;
• the central part comprises between 8 and 15 wt. % of cobalt;
• the outer part comprises between 0.5 and 2 wt. % of cobalt;
• the outer part is a columnar ring belt and comprises a chamfer;
• the outer part comprises an upper surface, a side surface connected to the circumferential wall of the cemented carbide substrate, and a chamfer surface connecting the upper surface and the side surface;
• the chamfer comprises a first terminal connected to the upper surface of the outer part and a second terminal connected to the side surface of the outer part;
• a vertical distance between the upper surface of the outer part and the second terminal of the chamfer is between 0.3 and 1.0 mm;
• a vertical distance between a middle point of the first terminal and the second terminal and the central part is between 0.35 and 1.0 mm;
• an axial height of the outer part is between 1.2 and 2.2 mm;
• and
• a vertical distance between the side surface of the outer part and the first terminal of the chamfer is between 0.2 and 0.6 mm.