An Art Deco sapphire and diamond plaque brooch,... Lot 31

An Art Deco sapphire and diamond plaque brooch, c.1920, An Art Deco sapphire and diamond plaque brooch, c.1920, of elongated elliptical form, with three graduated circular mixed cut sapphires, grain set to off-set milligrain box collets, and spaced along the bar, with a pierced lattice, milligrain set with graduated old European cut diamonds between the sapphires, with old Swiss cut diamonds to the other edge, tested as platinum and approximately 18ct gold, with a later safety chain fitted, and a case by 'Kelsey's, Potters Bar and Barnet, Herts', 73 x 9mm, 10.30g