Lot 123. A diamond necklace, Boucheron, French.  Estimate US$ US$ 40,000 - 60,000 (€38,000 - 57,000). Photo: Bonhams.  

designed as an articulated choker, composed of diagonal bombé spiral links, set with round brilliant-cut diamonds; signed Boucheron, no. P56088, with maker's mark and French assay mark; accompanied by a signed box; estimated total diamond weight: 27.50 carats; mounted in 18k white gold; gross weight approximately: 140.00 grams; length: 13 1/8in. 

Bonhams. FINE JEWELLERY, 24 Apr 2017, 15:00 EDT, NEW YORK