class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left>Based on the study of the variations of nitrogen and hydrogen of the diamond, the authors hold that the growth environment of the diamond underwent apparent changes with a clear growth pause between the two stages and, as a result, A centers could not be completely transformed into B centers at later growth stage. The consumption of nitrogen and hydrogen was remarkably at the nucleation phase, and they were almost completely consumed at last, then the crystal growth stopped until the surrounding environment changed. With the complement of nitrogen and hydrogen, the diamond continued to grow. It is also shown that the concentrations of nitrogen and hydrogen might have played an important role in nucleation. Under low saturation, the growth of diamond might be slower or even stopped. The discovery of this kind of diamond is of great significance in the study of geological environment changes during diamond growth processes. ce prefix = o ns = "urn:schemas-microsoft-com:office:office" />
