A collection of five carved stone and diamond brooches, mid 20th century

A collection of five carved stone and diamond brooches, mid 20th century, comprising: two designed as posies of violets, composed of carved amethyst and rose quartz, with nephrite leaves, accented with brilliant-cut diamonds, longest 6.3cm, each with Austrian assay marks for 14ct gold; a posy of forget me nots in carved blue hardstone accented with brilliant-cut diamonds, with nephrite leaves, length 4cm, Austrian assay mark for 14ct gold; a convolvulus flower in carved rock crystal, the centre set with circular-cut rubies and brilliant-cut diamonds, length 5.6cm, stamped 14K, signed Baumf; and a bouquet of flowers in carved moonstone, each centring on a single-cut diamond, length 4.1cm, stamped 750