Stuck out project on diamonds (9)

I believe the answer is:

protruded

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'stuck out' is the definition.
('protrude' can be a synonym of 'stick out')

'project on diamonds' is the wordplay.
'project' becomes 'protrude' (synonyms).
'on diamonds' becomes 'd' (I can't explain this - if you can you should believe this answer much more).
'protrude'+'d'='PROTRUDED'

Can you help me to learn more?

(Other definitions for protruded that I've seen before include "stood out" , "stuck out" .)

I've seen this clue in the Sydney Morning Herald.

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