An Art Deco diamond brooch, possibly continental

An Art Deco diamond brooch, possibly continental, designed as a spaced line of six oval rose cut diamonds, each in a millegrain edged field, to a pierced, beaded and millegrain geometrical mount, white on yellow metal stamped indistinctly '585' and tests for 14ct gold, pin with sliding safety catch, also safety chain; length 4.2cm, gross weight 5.5g, total estimated weight of diamonds approximately 0.60cts