LG, if you are comparing this 15ct orange pink diamond to the...

LG, if you are comparing this 15ct orange pink diamond to the best Argyle pinks it is well down the list in terms of colour.
Using GIA colour rating of Intense has it as the second best colour rating but with an orange secondary colour which is probably the 3rd rated secondary colour for pinks (Red/Purple).
Argyle produced their own colour ratings (1-9, one being best) to better reflect their unique, exquisite colours and this stone would likely be around the 5th colour, maybe 4th? add onto that the 3rd rated secondary colour and the millions/ct quickly drop into the hundred thousands per carat.
You then need to find a collector who want a 15ct orangey pink, heart shaped diamond for several million dollars!