Four gem-set brooches

Four gem-set brooches
1st: Circa 1950, of giardinetto design, the woven basket issuing a bouquet of flowers, set with various gemstones including brilliant-cut diamonds, circular-cut amethysts and peridot, 2nd: The seed pearl and rose-cut diamond moth atop a bar, 3rd: Of scrolling openwork design, set with rose-cut diamonds, 4th: The oval mother-of-pearl plaque with an applied seed pearl crown, with a black enamel border, 2nd later gold plating, lengths: 1st: 3.9cm, 2nd 4.9cm, 3rd 2.8cm, 4th 1.8cm (4)