Bernard Instone or Sybil Dunlop Necklace

Apologies for photos.
Well then this something special if your art & crafts crazy like me. It was being sold has Bernard Instone or Sybil Dunlop piece, to me it screams Bernard Instone even though he did make jewellery for Sybil Dunlops company after 1945.
Honestly I have never seen anything like this necklace, so I'm thinking it could be a commission piece.
The attention to detail is typically Instone. There are 7 Lavender chalcedony stones and inbetween are the most wonderful Instone silver leave work, the pink stones are probably paste or could be pink tourmaline. Absolutely in love with it but is it Bernard Instone or Sybil Dunlop. When I get back to the UK I’ll post more photo’s, I really can’t wait to see this, the seller did say there is no damage so could be a fantastic example of the art and craft movement.

Many thanks for looking.