Three carved hardstone brooches, Austria, mid 20th century

Three carved hardstone brooches, Austria, mid 20th century, comprising: a brooch designed as a spray of violets in carved amethyst and nephrite, accented with single-cut diamonds, mounted in gold, length 4.3cm, Austrian assay mark for 14ct gold, maker's mark IB; a cosmos flower brooch in carved chalcedony and nephrite, the centre set with a circular-cut diamond, length 7.3cm, Austrian assay marks for 14ct gold, maker's mark IB; and a wild rose in carved white chalcedony, centring on a cultured pearl, to a branch with carved nephrite leaves, length 7.8cm, Austrian assay mark for 14ct gold, maker's mark IB