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Synthetic type Ib diamonds have been treated in the temperature range of 1500℃—2500℃ under stabilizing pressures of 6.5 GPa and 9.5 GPa. All nitrogen aggregates found in natural type Ia diamonds have been produeed. The single substitutional nitrogen was converted into A-centres, B-centres and N3-centres. The 7,3 μm peak of the infrared absorption spectrum and the associated platelets have been farmed. The synthetic type Ib diamonds have become much harder after heat treatment at above 2000℃ under a stabilizing pressure of about 9.5 GPa. Natural type Ia diamonds have been treated up to 2700℃ under a stabilizing pressure of about 9.5 GPa. The 7.3μm, 7.8μm, 8.5μm, 9.1μm, 9.9μm absorption peaks in infrared absorption spectrum have been changed. A-centres have been converted into B-centres and broken up into single nitrogen atoms, forming N3-centres.
Synthetic type Ib diamonds have been treated in the temperature range of 1500 ℃ -2500 ℃ under stabilizing pressures of 6.5 GPa and 9.5 GPa. All nitrogen aggregates found in natural type Ia diamonds have been produed. The single substitutional nitrogen was converted into A-centers , B-centers and N3-centers. The 7,3 μm peak of the infrared absorption spectrum and the associated platelets have been farmed. The synthetic type Ib diamonds have become much harder after heat treatment at above 2000 ° C under a stabilizing pressure of about 9.5 GPa. Natural type Ia diamonds have been treated up to 2700 ° C under a stabilizing pressure of about 9.5 GPa. The 7.3μm, 7.8μm, 8.5μm, 9.1μm, 9.9μm absorption peaks in the infrared absorption spectrum have been changed. A- centers have been converted into B-centers and broken up into single nitrogen atoms, forming N3-centers.