BOLIN - ROBERT SCHWAN Cabochon ct. 17.70 circa emerald, old mine diamond and yellow 14K gold brooch, ct. 3.40 circa main diamond, diamonds in all ct. 10.10 circa, g 17.50 circa, length cm 3.50 circa. Russian assay and goldsmith marks RS. Provenance: Maria Alexandrovna, daughter of Czar Alexander II, married to Alfred Duke of Edinburgh Christie's, Magnificent Jewels, Geneva, 1979, lot 464 Courtesy of Christie's   Appended gemmological report SSEF n. 145784 10/04/2025, Basel

Estimate € 15,000 - 25,000