This paper reports on the three new Single Crystal Diamond (SCD) detectors installed at JET for the 2008 campaigns. The yields of both total and 14MeV neutrons produced during DD plasma pulses as well as the time dependent neutron emission have been measured. The first detector, installed in the Vertical Port (Oct-1) of JET, is 200mm thick and is embedded in paraffin. It has a detection efficiency of about 2.9*E-05 counts/n*cm2 for the 14MeV neutrons. The second detector, located in Oct-1 Limb 1/2 , is 104mm thick and is covered by a thermally evaporated 3mm thick 6LiF film in order to detect the total and the 14MeV neutrons. In addition, it is surrounded by a 2.5cm thick polyethylene shield to enhance its thermal neutron response. The third detector is mounted in the main horizontal port (Oct-6) and it is operated in an innovative way, that is with a single low capacitance super screened cable and the whole electronic chain is outside the JET Torus Hall. Furthermore it uses fast electronics, suitable to the fast diamond response pulse (< 1ns). It is 75mm thick, covered by a 3mm thick 6LiF film and surrounded by a 2.5cm thick layer of polyethylene. All the detectors have been previously tested and qualified at the ENEA-Frascati Neutron Generator with 2.5MeV and 14.7MeV neutron beams. After the description of their main features, the results of the measurements so far performed are reported showing a very good matching with other standard detectors, such as fission chambers and Si diodes, routinely used at JET.