Biedermeier medallion on a beautiful necklace with turquoises,

Biedermeier medaillon and beautiful necklace with turquoises, 18K yellow gold, silver medallion cover with half pearls and turquoises, reverse beautifully embossed and engraved, D: 3 cm, circa 1850, beautiful condition, loop from a later period, hooked into the centre of the necklace, L: 39.5 cm, ca. 1870-80, signs of age and wear, 1 connecting element missing, official hallmark Austria-Hungary 1872-1922.