Switzerland, ca. 1970. 750/- white gold, maker's mark, total weight: 32.5g. Heigth x width=ca. 9.5 x 4.5cm. 1 brilliant ca. 0.4ct W(H) VS1, 5 diamond navettes in total ca. 0.3ct W-TCR(H-I) VS, 1 oval black opal cabochon ca. 12.8ct (double), 5 oval black opal cabochons diameter ca. 8.0x5.6 - 6.4x5.5mm (doubles).- Career- 1943-47 Training as chaser and goldsmith in Zurich - 1949-1985 Work as goldsmith in Zurich - ab 1950 Proprietor of the family-owned jewellery store Batensperger in Zurich's Bahnhofstrasse.