The surface enhanced raman scattering (SERS) signal from the L-tyrosine (tyr) molecule adsorbed on gold nanoparticles (Au-tyr) is compared with the SERS signal assisted by the presence of gadolinium ions (Gd3+) coordinated with the Au-tyr system. An enhancement factor of the SERS signal in the presence of Gd3+ ions was similar to 5 times higher than that produced by L-tyrosine adsorbed on gold nanoparticles. The enhancement of the SERS signal. can be attributed to a corresponding increase in the local electric field due to the presence of Gd3+ ions in the vicinity of a gold dimer configuration. This scenario was confirmed by solving numerically Maxwell equations, showing an increase of 1 order of magnitude in the local electric scattered field when the Gd3+ ion is located in between a gold dimer compared With naked gold nanopartides.