A gold and platinum-mounted aquamarine and diamond brooch

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Bolin, workmaster KL, St. Petersburg, 1898-1908, scratched inventory number 25817rectangular form, centered with large faceted aquamarine within platinum border crowned with a bow, all set with rose-cut diamonds, verso with clasp pin, in the original silk and velvet-lined leather case, stamped with maker's insignia, 56 standard 2.8 x 2.2cm (1 1/8 x 7/8in).