title: Diamond type
context: Diamond type is a method of scientifically classifying diamonds by the level and type of their chemical impurities. Diamonds are separated into four types: TypeIa, TypeIb, TypeIIa, and TypeIIb. 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.[1]
question: What types of diamonds are there?
answers: TypeIa, TypeIb, TypeIIa, and TypeIIb