Brooch with rare old-cut diamond of approx. 5 ct

Brooch with rare old-european-cut diamond ca. 5 ct, cushion-cut, ca. STW-TIW (J-K)/VVS-VS, 14K yellow gold, setting of 16.8K white gold, 9.4 g, L: 8 cm, nice floral workmanship, 1st half of 20th century, very good condition. // Amendment 04.04.25: The diamond has only ca. 4 ct.