Classification of diamonds

According to whether the diamond contains N or does not contain N, the diamonds are divided into type I diamonds and type II diamonds, and then divided into type Ia diamonds and type Ib diamonds according to the different forms of the original N in the crystal lattice.

Diamonds are divided into type IIa diamonds and type IIb diamonds according to whether they contain P or contain P.

	Type I Diamond		Type II Diamond
	TypeⅠa	TypeⅠb	Type Ⅱa	Type Ⅱb
	The N content is 0.1%-0.3%, and N exists in the form of small aggregates in the diamond crystal.	The N content is<0.1%, and the N is in a separate dispersed state in the diamond crystal.	No N, no P	No N, a small amount of P
color	white,fancy vivid yellow	white、fancy light yellow、brown	white、brown、pink	blue、gray

Type Ia diamonds:

N atoms come in the form of N atom pairs or N3 centers, the more N3 centers, the yellower the diamond. 98% of natural diamonds are type Ia.

Type Ib diamonds:

N atoms exist alone, most of which are synthetic diamonds. Under certain temperature, pressure and time, type Ib can be transformed into type Ia diamond.

Type IIa diamonds:

N atoms exist in a free state and have good thermal conductivity. The thermal conductivity at room temperature is 5 times that of copper. It is an excellent heat dissipation material in the electronics industry.

Type IIb diamonds:

It is a semiconductor, the only one among diamonds that can conduct electricity, and can be used as a thermal sensor to measure temperature.

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Classification of diamonds

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