Brooch/pendant. Master Goldsmith Workshop Peter (1932-2015) & Marianne Heyden (born 1936), Cologne. Boulder opal in frame setting, over fan-shaped superimposed surfaces with granulations. 18 ct yellow gold, approx. 34 g, with ligated master mark "PHM" on the back side, h=4.3 cm, w=5.6 cm.
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