Hallberg started his career as an apprentice, with the art collector Christian Hammer in Stockholm, Sweden. In 1860, he opened his own shop, and from 1864, he marked his own jewellery with GCH.
For nearly twenty years, Hallberg’s shop thrived. At the turn of the century, the business successor, Jean Jahnsson turned the brand into the largest jewellery brand in Sweden, with several branches opening. In 1896 they became the Swedish crown jewellers and later opened a shop in Paris. In 1930 the brand had over 600 employees, with many of the staff being professional goldsmiths.
Over the years the brand received international success and today they have more than thirty shops across Sweden, continuing their 150 year legacy of tradition, quality and expertise.
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