18k yellow gold bow brooch presenting an oval-cut sapphire weighing approx. 3.50 ct in a setting of old and pink brilliant-cut diamonds (one small diamond missing), the pin clasp. Sapphire certified by the GemParis laboratory as being of Thai origin and heated (S2-2). Late 19th century. Sapphire size: 11.3 x 8.6 x 4.9 mm Height 1.8 cm - Width: 5.2 cm - Gross weight: 10.5 g