Norwegian David Andersen - 1964 David Andersen is Norway's leading silversmith, established in 1876. This sterling silver neckring is from the Troll Series introduced in 1964. Designed by Bjørn Sigurd Østern, the pendant features a cabochon of Thulite - a variety of manganese Zoisite - it is the national stone of Norway. This piece is fully hallmarked with early marks. Presented on a rare original neckwire.