It's impossible to make mistake with diamonds (2,4)
I believe the answer is:
no dice
'it's impossible to' is the definition.
I know nothing about this answer so I cannot tell whether this works.
'mistake with diamonds' is the wordplay.
'mistake' becomes 'nod' (I have seen 'Careless mistake' mean 'nod' so perhaps 'mistake' could also mean 'nod').
'with' is a charade indicator (letters next to each other).
'diamonds' becomes 'ice' (slang term for diamonds).
'nod'+'ice'='NO DICE'
'make' is the link.
Can you help me to learn more?
(Other definitions for no dice that I've seen before include "Certainly not" , "Emphatic refusal" , "Refusal (to play)" , "with which many games are unplayable" , "I refuse to play!" .)