The octagonal step-cut sapphire, weighing 6.93 carats, within a cartouche decorated with square, baguette and single-cut diamonds, one diamond deficient, ring size N

Accompanied by a report from GCS stating that the sapphire is of Basaltic origin, with no indications of heating. Report number 5775-2331, dated 23 June 2015.

Bonhams. FINE JEWELLERY, 24 Sep 2015 12:00 BST -LONDON, NEW BOND STREET