A ruby and diamond pendant, early 20th century

A ruby and diamond pendant, early 20th century, later converted, of navette design, centring on an old circular-cut diamond between two pear-shaped rubies alternating with old circular-cut diamonds in lozenge mounts, within a frame of old circular-cut diamonds, mounted in platinum, to a snake-link white gold chain, converted from a brooch, chain stamped 14ct, pendant length 4.8cm, chain length 45.5cm