Oval coral cabochon, hexagonal-shaped onyx, round diamonds, French assay marks for platinum (950‰) and 18K yellow gold (750‰), signed R.Boivin, French maker’s mark (Cristofol), 1976 Maison René Boivin, 2025: Certificate of Authenticity n°202512YRA, original piece manufactured by René Boivin in December 1976 after a drawing by Marie-Caroline de Brosses Size/Dimensions: 5.0 x 6.1 cm Gross weight: 44.12 grams This lot incorporates material from endangered species which could result in export restrictions.

F. Cailles, René Boivin, Joaillier, Les Éditions de l'Amateur, Paris, 1994, p. 132.