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An opal, emerald and diamond brooch, Oscar Heyman & Brothers. Brooch in the form of a fish, with scales of opals, cabochon emerald eyes and further detailed by round brilliant-cut diamonds; with maker’s mark for Oscar Heyman & Brothers, no. 200403; estimated total opal weight: 14.55 carats; mounted in eighteen karat gold; length: 3in. Via Bonhams.

An opal, emerald and diamond brooch, Oscar Heyman & Brothers. Brooch in the form of a fish, with scales of opals, cabochon emerald eyes and further detailed by round brilliant-cut diamonds; with maker’s mark for Oscar Heyman & Brothers, no. 200403; estimated total opal weight: 14.55 carats; mounted in eighteen karat gold; length: 3in. Via Bonhams.

Art Nouveau brooch-pendant. Set in yellow gold with plique-à-jour, opal, diamond and pearl. This brooch is not clearly marked, but there are brooches in this same style from the American firm Krementz & Company.

Art Nouveau brooch-pendant. Set in yellow gold with plique-à-jour, opal, diamond and pearl. This brooch is not clearly marked, but there are brooches in this same style from the American firm Krementz & Company.