An almost colorless diamond observed under the condition of normal light was stimulated under deep ultraviolet light with the DiamondViewTM. It showed a vivid blue fluorescence and strong greenish blue phosphorescence. It indicated that the phosphorescent could last for a few seconds. The 2 803 cm-1absorption peaks of the infrared spectra only appear during the phosphorescence released. As the phosphorescence disappeared, this peak would be absent.Theorically speaking, the phosphorescence of diamond is related to charge transfer between the boron acceptor and a deep donor, changing the charge state of the boron from compensated to uncompensated and back again. But, too much boron contained in the Type IIb diamond and other defects would disturb to prove the direct correlations between the change in the boron charge state and the emission of phosphorescence. This experiment shows that the 2 803 cm-1 peak immediate data dependency on the phosphorescence gave the most direct evidence that the charge transfer at boron acceptors are foremost linked to phosphorescence in diamond. In essence, the boron acceptor would lose the electron being excited states with the DiamondViewTM and become the uncompensated boron to cause 2 803 cm-1 peak. As the end of excitation from the deep ultraviolet, the uncompensated boron atom of metastable state would throw the excited states electron away. During the excited electrons return to the ground state, the diamond will show luminance as phosphorescence. The wavelength of the emitted photon depends on the distance between the donor and the acceptor, among other factors, for the boron acceptor, common is 500 or/and 660 nm. In this experiment, the phosphorescence band is more likely in the center at 500 nm because of the bluish green phosphorescence. This phenomenon is the first one found as the proof of charging transfer at boron acceptors causing phosphorescence in diamond.