Superhard constructions and methods of making same

A method of forming a super hard polycrystalline diamond construction comprising:

• forming an aggregated mass comprising a catalyst/solvent material for diamond, and one or more of W, Cr, V, Ti, Zr, Nb, Hf, Ta, Sc, and/or Y;
• forming a pre-sinter assembly comprising the aggregated mass and a plurality of diamond grains;
• and
• treating the pre-sinter assembly in the presence of the catalyst/solvent material for the diamond grains at an super high pressure of around 5.5 GPa or greater and a temperature at which the diamond material is more thermodynamically stable than graphite to sinter together the diamond grains to form a polycrystalline diamond construction, the diamond grains exhibiting inter-granular bonding and defining a plurality of interstitial regions therebetween, residual catalyst/solvent and one or more of dissolved W, Cr, V, Ti, Zr, Nb, Hf, Ta, Sc, and/or Y, in non-carbide form at least partially filling a plurality of the interstitial regions.