Lot 17. An art deco diamond, sapphire, spinel and black onyx dress clip, circa 1925. Estimate US$ 5,000 - 7,000 (€4,700 - 6,600). Photo: Bonhams.

of openwork geometric design, set with old mine and old European-cut diamonds, enhanced by a round mixed-cut spinel and an oval-shaped sapphire, highlighted by calibré-cut onyx; estimated total diamond weight: 2.30 carats; mounted in platinum; length: 1 3/8in.

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