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A method is provided for separating different rare earth metal oxalates by mixing the different rare earth metal oxalates in an aqueous solution comprising oxalic acid and an organic base so that at least one rare earth metal oxalate is soluble and at least another rare earth metal oxalate is not soluble. The different rare earth metal oxalates that can be separated can include at least one light rare earth metal oxalate and at least one heavy rare earth oxalate, or different heavy rare earth metal oxalates. The separation method can be incorporated as a step in a solvent extraction method that generates rare earth metal oxalates as an intermediate reaction product to simplify extraction processing and lower extraction costs.