They are generally thought to involve a process called plastic deformation that distorts their molecular structures. The exact processes that create red diamonds still remains a mystery. Type IIB contains no nitrogen but does contain boron. Type IIA are chemically the purest, with no measurable nitrogen or boron impurities. These are the most sought by collectors and investors. Pure Type IaB diamonds are very rare because they usually mix with Type IaA in the same stone. The nitrogen atoms are paired in the matrix of Type IaA diamonds and clustered in Type IaB. Types IaA and IaB comprise around 98% of all gem diamonds IaA are largely found in Cape Province, South Africa while IaB are found in Buffalo Hills, Namibia, and Eurasia. There are nine grades in the intensity scale :Įach natural color has its own perfect storm of minerals, ambient pressures and temperatures, incubation time (usually eons), gases, elements and other factors as the diamonds form deep within the earth.ĭiamonds are scientifically classified as either Type I or Type II, depending upon whether nitrogen is present, and how it is configured within the matrix. Intensity refers to a stone's level of color saturation.
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