NOT KNOWN DETAILS ABOUT COLOR CENTER DIAMOND CRYSTAL

Some diamonds may emit light for milliseconds to tens of seconds once the excitation is shut off—a phenomenon often called phosphorescence.Photoluminescence spectroscopy reveals that unstable defects are eradicated by HPHT remedy of Type IIa brown diamonds to decolorize them. Furthermore, the NV�?NV0 ratio will increase to >1 in treated diamond