An art deco natural pearl and diamond jabot pin, by Janesich, circa 1925. Photo: Bonhams.

Each terminal designed as a pair of opposing swans, pavé-set with single-cut diamonds and calibré-cut onyx highlights, with a natural pearl and two baguette-cut diamonds between their curving necks, signed Janesich, diamonds approximately 2.30 carats total, one onyx deficient, length 9.8cm. Estimate £12,000 - 15,000 (€15,000 - 18,000)

Accompanied by a report from The Gem & Pearl Laboratory stating that the pearls are natural. Report number 0128492, dated 1 July 2008.

Bonhams. FINE JEWELLERY. London, New Bond Street, 30 Apr 2014 - www.bonhams.com