Observe daughter pressure nobleman for gem (4,5)

I believe the answer is:

seed pearl

'gem' is the definition.
(I know that seed pearl is a type of pearl)

'observe daughter pressure nobleman' is the wordplay.
'observe' becomes 'see' (I've seen this in other clues).
'daughter' becomes 'd' (genealogical abbreviation).
'pressure' becomes 'p' (abbreviation).
'nobleman' becomes 'earl' (earl is a kind of nobleman).
'see'+'d'+'p'+'earl'='SEED-PEARL'

'for' acts as a link.

(Another definition for seed pearl that I've seen is " Very small gem".)

I've seen this clue in The Times.

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