The stone

Prince Albert (Prince Consort) and Sebastian Garrard stated that the Koh-i-noor was badly cut, it is rose-not-brilliant-cut. It was decided to seek the advice of practical and experienced diamond cutters. A small steam engine was set up at Garrard's shop, while two gentlemen, Messrs Coster, Mr. Voorzanger and Mr. Fedder, travelled to London to undertake the re-cutting of the diamond. The Koh-i-noor was embedded in lead, two weeks later, after examining the stone. Mitchell thought that it had lost nearly all its yellow colour and become much whiter. The re-cutting took 38 days and cost £8000 ($40,000). The final result was an oval brilliant diamond weighing 108.93 metric carats, which meant a loss of weight of just under 43 per cent. Its was now in stellar brilliant-cut, possessing the regular 33 facets, including the table, while the pavilion has eight more facets than the regular 25 bringing the total number of facets to 66.

In 1853, it was mounted on a magnificent tiara for the Queen, which contained more than two thousand diamonds. Five years later, Queen Victoria ordered a new regal circlet for the diamond. In 1911, Garrards made a new crown that Queen Mary wore for the coronation - it contained diamonds, among them the Koh-i-noor. In 1937, this was transferred to the crown made for Queen Elizabeth the Queen Mother, based on Queen Victoria's regal circlet and is set in a Maltese Cross at the front of the crown