Binary rare earth hydrides are ideal hydrogen rich materials for the search of room temperature superconductivity. Even though there are plethora of such theoretical predictions, only a few binary hydrides show high TC experimentally. The recent progress in the search for new ternary hydrides have led to the controversial discovery of room temperature superconductivity in the nitrogen doped lutetium hydride (LuH3-δNε) (NLH). This has stimulated the interest in the synthesis of lutetium hydrides and their detailed understanding. Phase pure LuH2 has been synthesized using pure Lutetium (Lu) metal and paraffin as hydrogen source at high pressure and high temperature conditions. The sample inside diamond anvil cell (DAC) has been characterised with optical micrographs using high resolution optical microscope. The recovered sample is characterised by employing synchrotron based angle dispersive x-ray diffraction (ADXRD) measurements. The lattice parameter of as synthesized LuH2 is in excellent agreement with the earlier reported one. The comparison of high pressure evolution of the unit cell volumes of synthesized LuH2, cubic LuH3 and NLH imparts broader understanding and opens the way for future research in lutetium based hydride systems. Data analysis at high pressures reveals that the parent structural framework of NLH is LuH2 rather than LuH3. Here, we have proposed a novel method for determination of hydrogen stoichiometry in ternary rare earth hydride systems. In this method, hydrogen to metal ratio (H:M) and metal-hydrogen (M − H) distance as a function of hydrogen-solubilities systematics for lanthanide dihydrides solid solution are utilized to constrain the concentration of hydrogen in these compounds.