A German 18k gold, black opal, demantoid, blue sapphire and pearl brooch.

A German 18k gold, black opal, demantoid, blue sapphire and pearl brooch. Curved square motif set with a large cushion shaped black opal (c. 13.10 x 17.47 mm), 16 round demandoid garnets (in total c. 3.40 ct), four blue sapphires (in total c. 0.60 ct) and twelve pearls (diameter c. 3.00 - 4.80 mm) in various sizes and colours. Hallmarks: Fineness 750, maker's mark "ET". 4.5 x 4.5 cm. Weight 30.88 g. In the original case. Elisabeth Treskow, Essen, c. 1967.

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Ca Ø 0,3–0,5 cm · vikt 30,9 g