A BOUCHERON Ring 750/1000 bicolour gold set with 20 brilliant cut diamonds with an approximate weight of 0.40 ct. and an oval cut one with an approximate weight of 0.60 ct. French 20th C. (mid) signs of use marked and numbered B353 21123, remarked with Lisbon contrast (post-1985) Dimensões (altura x comprimento x largura) - 15 (17,5 mm) cm; Peso - 7,9 g. Notes: Provenance: Jewelry Collection of a Soprano of the São Carlos National Opera House, Lisbon.