Ringwoodite mineral is only stable at very high pressure, temperature condition approx. depth of 660kms. Ringwoodite contain high amount of water in chemical structure. Presence of ringwoodite inclusion in deep seated diamond proves there is huge reservoir of water between lower and upper mantle. This water volume may be large as ocean at surface. Even researchers claimed this deep ocean may three times larger in volume than ocean water. From the study of Botswana diamond comes from depth of 660km is rare. Researchers reveal is secret through Raman Spectroscopy and FTIR Spectrometry . This researchers suggest the source of this water may come through ocean during subduction at convergence plate margin.