A fine and rare diamond brooch, possibly Portuguese, late 18th century

A fine and rare diamond brooch, possibly Portuguese, late 18th century, designed as a bow suspending an articulated pendant modelled as a lily, set with cushion-shaped, circular, single-cut, and oval diamonds, mounted in silver and gold, measuring 5.2 x 5.0cm, later brooch pin, case stamped Harvey & Gore

Provenance: the collection of the late Michael Wellby, Sotheby's London, 11th December 2012, lot 32

Cf.: Brilliant Impressions: an exhibition of Antique Paste and Other Jewellery, Diana Scarisbrick and SJ Phillips, London, 2010, no. 138, p.104, for a Portuguese white beryl choker from the third quarter of the 18th century with an almost identical bow motif as its central element