Bonhams 1793 : An elegant diamond single-stone ring,

Accompanied by a certificate from GIA stating that the diamond is I colour, VVS2 clarity. Certificate number 2155050534, dated 18th October 2012.

The Royal Asscher Diamond Company was founded in 1854 by Abraham Isaac Asscher and is still owned by the family today.

Joseph and Abraham Asscher, Abraham's sons, became two of the most illustrious diamond experts of the 20th century and handled and cut some of the world's greatest diamonds such as the Excelsior and the Culinan. Legend surrounds the cutting of the 3,106 carat Culinan, with rumours of Joseph breaking his tools and fainting once the cleaving strike was made. In truth, after he hit the Cullinan in exactly the right place and it cleaved according to his original calculations, he paused, crouched to examine his work and then rushed into the next room to let out a relieved cheer.

In 1902 Joseph Asscher invented the celebrated Asscher-cut, the first signature cut of a diamond. The Asscher-cut is still regarded today as one of the most innovative and prestigious cuts of diamond.