The majority of orange diamonds come from Africa. The interest in this color surged in 1997 with the auction of the Pumpkin Diamond, so named by the buyer Ronald Winston as it was purchased the day before Halloween. The 5.54 carat vivid orange diamond, was at the time the largest vivid orange diamond ever found.
Orange diamonds are without a doubt among the most cherished colored stones in existence, meaning that any time one is discovered or offered on the auction block, it generates substantial hype and interest from collectors.
Most orange diamonds are found in one of two places: the Argyle mine in Australia or South Africa.
The vast majority of all diamonds contain some nitrogen. In Orange diamonds the nitrogen atoms have grouped themselves in a very specific way. This happens during and right after the diamond is formed. These nitrogen arrangements absorb light in the blue and Yellow region of the spectrum producing an Orange color. Orange diamonds may contain a Brown, Yellow or Pinkish modifying color.
The strength of color is one of the most important factors in determining the value of a natural color diamond. The value of a natural color diamond increases with the intensity of the most prominent color within the diamond. Same as every other natural color diamonds (except for Red diamonds & Black diamonds) the Orange diamonds has has a color-strength scale which starts at: faint Orange, Very Light Orange, Light Orange, Fancy Light Orange, Fancy Orange, Fancy Intense Orange, Fancy Deep Orange and Fancy Vivid Orange which is the higher grade.