DAVID YURMAN necklace from the Osetra® Collection. Sterling silver with darkened finish. Faceted green onyx pendant. Woven silk cord with sliding toggle clasp. Approx. 42″L. About David Yurman: In 1980, sculptor-turned-jeweler David Yurman introduced his eponymous collection. His artistic, sculptural pieces were a refreshing new interpretation, but David Yurman truly changed the trends of fashion with his now-classic twisted cable-inspired pieces.