Oval-shaped tanzanite, round coloured diamonds and diamonds, French assay mark for 18K yellow gold (750‰), signed René Boivin, French maker's mark (Société René Boivin), 1977, René Boivin fitted case Maison René Boivin, 2025: Certificate of Authenticity n°202512YRD, original piece manufactured by René Boivin in November 1977 after a drawing by Marie-Caroline de Brosses Gem Paris, 2025, report n°202419788470-3: tanzanite, tanzanites are commonly modified by use of thermal process Tanzanite: for an approximate weight of 3.00-3.40 carats Coloured diamonds: for an approximate total weight of 1.50-1.70 carat Diamonds: for an approximate total weight of 0.30-0.50 carat Size/Dimensions: EU ring size 501⁄2/ US ring size 51⁄4 Gross weight: 12.54 grams Please note that coloured diamonds have not been tested for natural colour.

Veuillez noter que le prix de reserve de ce lot est de 18 000 euros. Please note that the reserve price of this lot is 18 000 euros