pearlescent (8)
I believe the answer is:
nacreous
'pearlescent' is the definition.
(synonyms)
This is all the clue.
(Other definitions for nacreous that I've seen before include "Scan roue for mother-of-pearl resemblance" , "Use acorn to get mother-of-pearl look" , "Consisting of mother-of-pearl" , "To do with or looking like mother-of-pearl" , "of oyster shells" .)