Jan Gjaltema Influenced by his education and experience in architecture, Dutch born Jan D. Gjaltema combines the linear and structural with the modern and forward. The goal: to produce a most varied and distinctive collection of hand-crafted sterling silver jewelry for women and men. In 1983, Jan turned his full creative attention to fine jewelry design. The results of his efforts have been nothing short of spectacular. Jan's jewelry graces the finest galleries and museums throughout Europe, the U.S., and Japan.