An Art Deco conch pearl, natural pearl and diamond brooch-pendant, by Bulgari. Photo Christie's Image Ltd 2012

he diamond-set scalopped lozenge-shaped openwork panel with baguette-cut diamond detail at the cardinal points and centering upon a conch pearl, measuring approximately 10.8-12.1 x 14.3 mm, flanked by diamond collets and button-shaped natural pearls, weighing approximately 13.53 and 12.66 grains, 1930s, 7.3 cm. Signed Bulgari. Estimate CHF30,000 - CHF40,000 ($32,180 - $42,907). Price Realized CHF105,000 ($111,279)

Accompanied by report no.62374 dated 28 February 2012 from the SSEF Swiss Gemmological Institute stating that the pearls are 1 natural conch pearl and 2 natural saltwater pearls

Christie's. MAGNIFICENT JEWELS, 16 May 2012, Geneva