Research Article
Spectroscopic Characteristics of Treated-Color Natural Diamonds
Figure 4
The FTIR spectra of the treated-color diamond collected in the midinfrared range reveal typical features of type Ia diamonds, with various aggregation states of nitrogen. The H1a absorption at 1450 cm−1 and the isolated nitrogen-related peaks (1344 and 1331 cm−1) were also observed in some of them.