Pink diamonds, and others in the broad palette of colors that occur naturally in some diamonds were developed through complex natural processes at the time of their formation. 

Billions of years ago, at the dawn of creation, when unstable forces churned deep within the planet in a fiery cauldron of molten rock, this tumultuous environment produced one nature’s greatest masterpieces—diamonds. As the magma cooled and hardened over time, immense pressure and temperature transformed this pure crystalline carbon into the substance we know as diamond. As this happened, trace chemical elements and gasses were trapped inside of some diamonds. This interaction with the carbon atoms resulted in the variety of natural wonders we now see. For example, chemical elements such as nitrogen, sulfur, and boron resulted in shades of yellow, green and blue.  

Pink diamonds, however, are different, and their origin story is a bit more mysterious. Scientists have never been able to pinpoint any other elements that caused diamonds to be red or pink. Rather, it is their best educated hypothesis that extreme pressure exerted on the diamonds after their formation altered the lattice structure of the crystal, resulting in the unique spectrum of uber-rare red and pink diamonds.