Superhard constructions and methods of making same

A super hard polycrystalline construction comprising:

• a first region comprising a body of thermally stable polycrystalline super hard material having an exposed surface forming a working surface, and a peripheral side edge, said polycrystalline super hard material comprising a plurality of intergrown grains of super hard material;
• a second region forming a substrate to the first region;
• and
• a third region interposed between the first and second regions;
• wherein:
• the third region extends across a surface of the second region along an interface surface, the interface surface having an uneven topology with peaks and troughs, the third region comprising a composite material having:
• a first phase comprising a plurality of non-intergrown diamond grains, and a matrix material, the matrix material comprising between around 5 vol % to around 80 vol % of the third region;
• and
• a second phase;
• the non-intergrown diamond grains and the second phase of the composite material comprise between 20 vol % to 95 vol % of the third region;
• and
• the third region has a wear resistance at least three times less than a sintered polycrystalline diamond material having the same average grain size of diamond grains as the diamond grains in the third region.