This is the final stage of "Diamonds are a Girl's Best Friend" series. To locate this cache, you will need to first find Stages 1 and 2 (stage 3 has now been archived) and get the necessary clues and facts, then perform the following computations to locate the actual coordinates.
A = the number of sides of the Stage 1 clue.
B = the number of corners in the Stage 2 clue.
C = the old Stage 3 clue which is 9.
DE = A x B
F = A + B
GH = DE + I
I = Atomic number of diamond
Substitute the letters above into:
N 43 DE.AFB
W 80 GH.IC2
Finally, add the atomic weight of diamond (rounded to 3 decimal places) to each of the N and W coordinates to get the final location.
Diamonds Are A Girls Best Friend - Stage 1
Diamonds Are A Girls Best Friend - Stage 2