A gold backed, silver set, diamond and cultured pearl pendant necklace in an interlooped tied ribbon

A gold backed, silver set, diamond and cultured pearl pendant necklace in an interlooped tied ribbon bow design, claw set with four principal circular cut diamonds, further set with smaller circular cut diamonds and four cultured pearls at intervals, the front with a pendant drop terminating with a claw set circular cut diamond, unmarked, length 5.7cm, with a gold neckchain, detailed '750', on a boltring clasp, total weight 11.4g, with a case (the drop currently detached).