The DMGC-project (Diamonds and the Mantle Geodynamics of Carbon) is an international initiative to study diamonds to better understand - among others - the pathways of carbon exchange between surface and deep Earth, characterizing primordial carbon and the dynamics of the Earth's interior. It is one of the multiple projects supported by the Deep Carbon Observatory (http://deepcarbon.net/) supported by the Sloan foundation.
Within the DMGC concortium, the Paris group aims to analyse diamond for C- and N-isotopes, N-content and N-aggregations state. Several types of analyses such as C-isotopes, N-content and N-aggregations state of diamond are not too difficult to perform and we had several PhD-students and post-doctoral fellows who came to perform their measurements.
Another DMGC-target investigated in IPGP to develop diamond oxygen geochemistry.