The Research Center Plasma-Materials-Nanostructures (CRPMN) LPSC will do the treatment of surfaces and metallization of some crystal CVD diamonds. Obtaining ohmic contacts that stick to the crystal and low resistivity is a key element for the experimental device. The treatment will be carried out using the DMW (Distributed Microwave Plasma) technology, a unique and versatile technology developed by CRPMN. Such technology allows processing both at very low pressure using an ion beam (cleaning, assisted plasma spraying) and at high-pressure (e.g. treatment by reactive plasma).