A fancy-coloured diamond cluster ring, by Bulgari, circa 1965. Photo: Bonhams.

The fancy intense greenish-yellow brilliant-cut diamond, weighing 1.38 carats, within a tiered surround of marquise-cut and pear-shaped diamonds, remaining diamonds approximately 5.30 carats total, signed Bulgari, ring size N. Estimate £10,000 - 15,000 (€12,000 - 18,000)

Accompanied by a report from AnchorCert stating that the diamond weighing 1.38 carats is Fancy Intense Greenish Yellow, natural colour, VS2 clarity. Report number 20012838, dated 27 November 2013.

Bonhams. FINE JEWELLERY, 30 Apr 2014, London, New Bond Street - www.bonhams.com