Patent ID: 8567531

Claim:
A cutting element comprising: a polycrystalline diamond body comprising: an interface surface; a top surface opposite the interface surface; a cutting edge meeting the top surface; and a material microstructure comprising a plurality of bonded-together diamond grains and interstitial regions between the diamond grains; wherein a first region of the microstructure proximate the cutting edge comprises a plurality of the interstitial regions that are substantially free of a catalyst material, and wherein the first region extends from the cutting edge to a depth of at least 300 microns, wherein a second region of the microstructure proximate the interface surface comprises a plurality of the interstitial regions comprising the catalyst material disposed therewithin, wherein the first region comprises a diamond average grain size less than 25 microns, and wherein the first region has at least one of the following properties: an apparent porosity less than (0.1051)·(the diamond average grain size ^−0.3737), or a leached weight loss less than (0.251)·(the diamond average grain size ^−0.2691), or a diamond volume fraction greater than (0.9077)·(the diamond average grain size ^0.0221), with the diamond average grain size provided in microns.