One can find original colored diamonds to purchase from the 'Original Diamonds' website. They have diamonds listed in colors 'Exceptional White' and 'Rare White'.

The largest producer of chocolate and other brown-colored diamonds (champagne, cognac) is the Argyle diamond mine in western Australia. Brown colored diamonds are also found in Africa.

Black diamonds are more rare than regular diamonds. They are one of the most rare species of colored diamonds.

Harlequin.

There are really color diamonds which are rare and thats why they expensive