Pink diamonds are found deep beneath the earth's surface: unlike most diamonds which form due to the interaction of various elements, pink diamonds are formed due to the extreme conditions of heat and pressure which cause changes in the lattice structure of the stone. Pink Diamonds with overtones are affordable, but also unique because they come with a different shade of pink. This beauty is GIA certified and bears a good clarity of SI2. Â Invest in a unique pink diamond with a purple undertone.