Exceptional Art Nouveau ring with large blister pearl

Description:

Master AZ, around 1900-1910
RM 55
750/000 yellow gold (stamped). 30 diamonds in different cuts totalling ca. 0.40 ct H/SI-P. Größere blister pearl. Grüne window enamel. Master's mark "AZ" in lozenge not identified. Weight 6.6 g.
Private collection Upper Bavaria.
Literature:
Catalogue of the Bavarian National Museum: Pariser Schmuck, München 1989. For the type see figs. 172, 217 and 251.