18k yellow gold. Shoulders of band with finely chased braid motif and profiled quatrefoil ring head staffed with black enamel. Set with a tourmaline in square cut (approx. 3.26 ct, approx. 8.12 x 8.16 x 6.13 mm). Hallmarked 750, 'Jakob'. Enamel with minimal losses, peridot cut edges worn. Ring head 13 x 13 mm. Size 55. Weight 16.18 g. Otto Jakob, Karlsruhe, 1990s.