Diamonds are essentially entirely composed of carbon. However, many diamonds crystals contain minute quantities of trace elements other than carbon atoms, and the most common is nitrogen. These trace elements can produce body color in diamonds such as yellow and blue. Classifying diamond types based on their chemical and physical properties.
Scientifically diamonds are classified into two types (Type I and Type II) depending upon whether nitrogen is significantly present or not in its carbon crystal structure. Diamonds are further subdivided accordingly to the arrangement of nitrogen atoms (isolated or aggregated) and the occurrence of boron impurities.
Diamond types and the lattice defects are directly related to the color of the diamonds.
Type I diamonds contain nitrogen atoms as a major impurity (up to 0.2%).
Type II diamonds do not contain nitrogen to significantly impact impurity.
*Even Type II diamonds contain very small amounts of nitrogen and do not affect the physical properties significantly.
Type I diamonds have nitrogen as impurities.
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