Lot 446. Citrine bangle, 'Tranche', René Boivin, circa 1934. Estimate 30,000 — 49,000 CHF. Lot Sold 187,500 CHF. Photo Sotheby's

Of geometric design decorated with graduated lines of calibré-cut citrines of various hues, inner circumference approximately 120mm, indistinct maker's mark for René Boivin. 

Accompanied by a certificate from Françoise Cailles. 

BibliographyCf.: Françoise Cailles, René Boivin Joaillier, Paris, 1994, pg. 179 for an illustration of a similar bracelet. 

 Sotheby's. Magnificent Jewels and Noble Jewels, Geneva, 11 nov. 2015, 10:00 AM