Hmm - not convinced - I think it may be tighter than that. Decision for me is if the "straight clue" is wordly jewellery or choral piece .
Obvious choice for choral piece in ME would be the music of the Ainur but I cannot make the worldly jewellery fit that just now....
If choral piece is cryptic then I think that part of the word "choral" is found in the answer. (Edit but that doesnt work either
) Off to dig more......