Further to my last post, please note that I confused two pieces in my head! Kevin Coates made a Magpie Brooch which was shown at Goldsmiths': the Magpie Neckpiece to which I referred was by Charlotte de Syllas. Apologies to both makers.
The neckpiece can be seen on her website: http://www.charlottedesyllas.com/
Jewellery talk and more from Dauvit Alexander, The Justified Sinner.