18k yellow gold. Open curved band with spring-clamped lapis lazuli sphere (diameter 9.0 mm). Hallmarked 750, maker's mark 'B'. Size 57. Total weight 11.63 g. Friedrich Becker, Düsseldorf, 1960s. The aviation engineer and goldsmith Friedrich Becker designed the model for this sphere ring with variable replaceable spheres in 1957 and received the Bavarian State Prize for it in 1959.