Lustrous structures in oysters (6)

I believe the answer is:

pearls

'lustrous structures in oysters' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for pearls that I've seen before include "Drops" , "Gems from oysters" , "Lustrous beads" , "Nacreous gems" , "types" .)

I've seen this clue in The Irish Times.

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