A late 19th century diamond tiara / necklace

A late 19th century diamond tiara / necklace, set with a line of graduated old cushion-shaped diamonds in scallop-edged mounts suspending undulating foliate drops set alternately with cushion and pear-shaped diamond terminals, in silver and gold cut-down collets, rhodium plated, with conforming diamond-set back section (three links removed) which can be attached so the tiara can be worn as a fringe necklace, fitted case