Lot 129. A 7.13 carats Kashmir 'Royal Blue' sapphire and diamond cluster ring. Sold for £506,500 (€643,640) inc. premium. Photo Bonhams.

The cabochon sapphire, weighing 7.13 carats, within a surround of old brilliant-cut diamonds, diamonds approximately 2.50 carats total, ring size N½

Accompanied by a report from SSEF stating that the sapphire is of Kashmir origin, with no indications of heating. The report states that the colour of this sapphire may also be called 'royal blue' based on SSEF reference standards. Report number 83631, dated 21 January 2016.

Bonhams. AUCTION 23401: FINE JEWELLERY, 12:00 BST - LONDON, NEW BOND STREET