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A natural pearl, gem-set and enamel swan brooch. Photo courtesy Bonhams.

set with a natural, freshwater pearl, weighing 82.82 carats; with pavé-set diamond head and tail, circular-cut ruby eye and black enamel beak, enhanced by calibré-cut sapphire feet and adorned with seed pearl and turquoise accents;estimated total diamond weight: 4.75 carats; mounted in platinum and eighteen karat gold; length: 2in. (seed pearls not tested for origin). Estimate: US$ 18,000 - 25,000 (€13,000 - 18,000) (£11,000 - 16,000)

Accompanied by report #07931 dated June 11, 2013 from The Gem and Pearl Laboratory, stating that the pearl as: natural (freshwater)
Bonhams. 17 Oct 2013 11:00 EDT New YorkFine Jewelry.