Crossword Genius

Executed search after extremely rough diamond (5)

Ross

I believe the answer is:

rhomb

I'm a little stuck... Click here to teach me more about this clue!

'diamond' is the definition.
(I know that diamond can be written as rhomb)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for rhomb that I've seen before include "Four-sided figure" , "Quadrilateral with four equal sides" , "Figure on plane" , "Equilateral parallelogram" , "Crystal shape" .)

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