Unravelling the picture clue might help you make some sense of my little rhyme:
I don't care who or why or what
Because I don't know when or where
Could be today or could be tomorrow
And it could be here or there!
You need to identify eight 'diamond geezers', A to H, in the order determined by the rhyme. If you then assign each of them their standard value, the cache can be found at:
N 51° 17.XXX W 000° 37.YYY
where XXX = ( A * B * C * D / 4 ) + 5
and YYY = ( E * F * G * H ) + 19
Congratulations on the FTF to BigMal70.