Diamond type
Diamond type is a method of scientifically classifying diamonds by the level and type of their chemical impurities. Diamonds are separated into four types: Type Ia, Type Ib, Type IIa, and Type IIb. The impurities measured are at the atomic level within the crystal lattice of carbon atoms and so, unlike inclusions, require an infrared spectrometer to detect.
Diamond firetail
There are few mutations in the diamond firetail, however, one mutation produces an orange tail, instead of the fiery red, in this case the bird is known as the yellow diamond. Other mutations are the pied diamond which has splashes of white, the white diamond, and the fawn diamond.