A coloured diamond and diamond pendant necklace. Photo Bonhams

The square-cut diamond of yellow tint, weighing 0.86 carats, within a brilliant and single-cut diamond surround, suspending a pear-shaped diamond of yellow tint, weighing 1.20 carats, within two borders of brilliant-cut diamonds, terminating in three brilliant and pear-shaped diamonds, to a trace-link chain, remaining diamonds approx. 3.15cts total, lengths: chain 44.0cm, pendant 5.7cm - Estimate: £12,000 - 14,000 (€15,000 - 17,000) 

Accompanied by a GIA report check statng that the pear-shaped diamond, is fancy intense yellow, natural colour, VS2 clarity. Report number 11896135, dated 5th March 2002. Copy available upon request from the GIA.

The square-cut diamond, report details confirmed by the GIA as fancy intense yellow, natural colour. Report number 12286840. Copy of report available upon request from the GIA.

Bonhams. 11 Jul 2012 11 a.m. London, Knightsbridge. Jewellery