An Edwardian diamond and natural pearl set tiara converting to a necklace

An Edwardian diamond and natural pearl set tiara converting to a necklace, of foliate form and set with five pearls and graduated cushion-shaped diamonds in silver and gold. On a metal frame. With a gold and silver knife-edge back chain with rose-cut diamond-set cut down collets. 28cm long. Fitted case by Edward Tessier, 25 New Bond St.