Crossword Genius

Warning saying that the diamonds are fake? (6)

Ross

I believe the answer is:

notice

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'warning saying that the diamonds are fake?' is the definition.
'notice' can be an answer for 'warning' (I've seen this before). I am not sure about the remainder of the definition.

'warning saying that the diamonds' is the wordplay.
'warning saying' becomes 'not' (I can't justify this - if you can you should give a lot more credence to this answer).
'that the diamonds' becomes 'ice' (slang term for diamonds).
'not'+'ice'='NOTICE'

Can you help me to learn more?

(Other definitions for notice that I've seen before include "warning to quit" , "Advance warning of job resignation" , "Notification" , "Instruction" , "Poster; observe" .)

I've seen this clue in the Evening Standard.
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