Amethyst and tourmaline ring, René Boivin, 1946. Estimate 8,000 — 12,000 GBP. Photo Sotheby's

Set with a step-cut amethyst between lines of similarly cut tourmalines, size N, signed René Boivin, French assay and indistinct maker's marks.

Bibliography: Cf: Françoise Cailles, René Boivin Joaillier, Les Éditions de l'Amateur, Paris, 1994, page 170 for an illustration of this ring.

Accompanied by a certificate from Françoise Cailles.

Sotheby's. Fine Jewels, London, 1 dec. 2015, 10:00 AM