A diamond and ruby necklace.  Photo Bonhams

The highly articulated entwined serpent, the head set throughout with cushion and old brilliant-cut diamonds, highlighted with oval-cut ruby eyes, to a snake-link chain,diamonds approx. 8.10cts total, French assay marks, length 41.0cm. Estimate: £10,000 - 12,000 (€12,000 - 15,000)