It's oval, naturally yellow and stunningly beautiful.

The world's largest Forevermark Fancy Yellow Diamond comes from the De Beers stable and was put up for auction online -- the first of its kind -- on October 7-8 last year.

This brilliant, oval-cut diamond weighs 42.02 carats and was cut painstakingly over a period of three months; the original stone weighed 78.2 carats.

Its auction value was been pegged at somewhere between $ 606,745 and $ 719,100.

However, this one is tiny compared to some of the largest diamonds in the world.