Footnotes

• Please note there will be no live bidding available on this lot
  Accompanied by a report from GIA stating that the diamond is D colour, Internally Flawless clarity. Report number 1196465491, dated 22 June 2018.
  
  Accompanied by a GIA type classification letter stating that the diamond is Type IIa, dated 22 June 2018.
  
  The diamond has been held in high esteem for millennia, admired for its exceptional hardness, liquid transparency and the beauty of its crystal form.
  
  The Rasaratna Samuccaya, a 13th century text on minerals and mining, states that "good diamonds" were supposed to be ujjala (bright), adosa (flawless) and amalavaritara (free from impurities and transparent like water). This diamond, offered at auction for the first time, is just such an extraordinary gem. Weighing 24.31 carats, its weight alone distinguishes it as a truly rare specimen. Awarded D colour and Internally Flawless clarity grades by GIA, the combination of attributes which this stone possesses is exemplary and scarce in nature. A further characteristic which sets it apart is its Type IIa classification.
  
  Type IIa diamonds make up less than 2% of all natural gem-quality diamonds. They are categorised by their chemical composition; unlike the great majority of 'white' diamonds, Type IIa diamonds are composed almost purely of carbon. They are exceptional because they contain very little nitrogen, or none at all, which allows light to pass easily through the stone. The optical effect is a limpid, colourless appearance, of fabulous purity. Many of the most famous diamonds throughout history have been Type IIa, including the famous Koh-i-Noor (Mountain of Light) and the world's largest cut diamond, the Cullinan.
  
  The present lot is exceptional for its elegant cut, crystalline transparency and significant size. Bonhams is delighted to offer such a magnificent diamond for sale.

Saleroom notices

• Please note there will be no live bidding available on this lot