Johann Michael Wilm, amethyst and diamond pendant necklace, the brushed and polished gold plaque with rope twist, coil, cup and bar applique, collet-set with old European-cut diamonds and centred by a circular-cut amethyst with estimated weight 400 carats, suspended from a fine belcher link 18ct gold necklace, applied maker's mark, 18ct gold, weight 37.3gm. Length pendant 5.5 cm, necklace 52 cm. Johann Michael Wilm 1885 - 1963 . Johann Michael Wilm was apprenticed to his father's workshop. He studied drawing at the Academy of fine Arts in Hanau. He established his Munich based business in 1919, researching and refining the Etruscan skill of granulation, in the mid 1920s he introduced cloisonne enamel into his work based on Byzantine themes and masque motifs in the mid 1930s. He is most noted for his use of granulation, filigree and ornate settings using diamonds, pearls and precious stones. 'Gold and precious stones are the imperishable and everlasting material of this world. And if in a thousand years one will start to excavate our epoque, then hopefully one won't just find pieces of old sewing machines and electric cookers, but also a few pieces of jewellery. Because these jewels should mirror our world; that even the birth pangs of industrialization could not extrude or even extinguish the desire for beauty and the love for jewels and aesthetic forms.' J M Wilm.