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An Art Deco emerald and diamond plaque brooch, c.1925, of stepped rectangular form. Two principal old brilliant cut diamonds, grain set in box collets in a vertical row to the centre. An obus collet each side, grain set with an old European cut diamond, with pairs of old Swiss cut and old eight cut diamonds, above and below. A row of old Swiss cut diamonds to each side, with a row of slightly graduated circular mixed cut emeralds above and below. A stepped outer frame, grain set with a row of graduated old Swiss cut and old eight cut diamonds, with a further emerald at each end. Tested as platinum and 18ct gold. Principal diamonds estimated as approximately 0.53ct and 0.65ct each. 49 x 22mm, 11.90g. Assessed as approximately: Colour: I/J Clarity: VS2/SI1