Following is a look at what gives color to the stone on a lovely 3-carat pink diamond engagement ring.     Colorlessness in a diamond is the result of carbon atoms bonding without any structural defects or impurities. Even the stone’s trip to the top should go perfectly for this outcome to be achieved, even though the former involves an erupting volcano. A colored diamond is what you get if there were impurities mixed in during formation. These “imperfections” are very rare, and their consequences are almost always visually stunning. A tiny bit of boron in the stone can give it a blue hue, while trace amounts of nitrogen would turn a stone yellow or even orange. Apparently, when two or more minerals combine, it forms a magnificent colored diamond. Each of these colors has a huge market because these stones contain unique touches from nature that are well worth showing off.