Details
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 5012/ US ring size 514
Gross weight: 12.54 grams

Please note that coloured diamonds have not been tested for natural colour.
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