It has become clear in recent years that the important substitutional impurities indiamond are nitrogen,hydrogen and boron(Bibby,D.M.,1982).The physical andchemical properties of diamond are determined by the content and form of occurrenceof nitrogen based on which diamonds are generally classified.The well-known experi-ments concerning the mutual transformation of the forms of nitrogen in diamondby Evans,T.et al.(1982)have provided a theoretic basis for the origin of diamond.