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A French sapphire and diamond plaque brooch
A French sapphire and diamond plaque brooch, c.1930, the rectangular brooch pavé-set with round brilliant and single-cut diamonds, square-shaped sapphires and baguette-shaped diamonds in platinum, French control mark, the white gold pin with French control mark and maker's mark (possibly L. Frerès et Cie, 4.7cm wide
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