SILBERMANN ring with oval, white star sapphire

SILBERMANN ring with white oval star sapphire of c. 16 ct, surrounded by small round fac. dark blue sapphires, WG 18K, 10.9 g, RW: 56, 2nd half of 20th century, signs of wear, blue sapphires slightly abraded, maker´s mark Andreas Silbermann, Stuttgart, solid craftsmanship, very fine star sapphire showing distinct star.