A beautiful antique Swedish Art Deco 18k gold 1.15 carat green tourmaline solitaire engagement ring, hallmarks for CF Carlman, Stockholm, Sweden, 1923. In the 19th and 20th century CF Carlman was the premier jeweler in Sweden and was the Court Jeweler to the Swedish royal family responsible for their commissioned pieces. Carl Frederick Carlman was a co-director of the Hjortzberg jewelers in 1854 before taking over the firm in 1855. In 1889 Carl’s son Ryno took over the company and following in his father’s footsteps of excellence was awarded the Diploma of Honor and the Honorary Gold Medal from Queen Wilhelmina of Holland. In 1893 the company represented Sweden in the World’s Columbian Exposition in Chicago.