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Herein, we investigate the crystallization of the amino acid L\u2010Cysteine and show that both the structure of the crystal and its intrinsic fluorescence can be drastically altered by the solvent. Crystals formed in heavy water exhibit markedly different intermolecular packing as well as strikingly different monomer conformations compared to those in light water. Remarkably, these differences in the supramolecular packing result in significantly elevated intrinsic fluorescence in the crystal that is formed in heavy water. Using a combination of experimental techniques and advanced electronic structure approaches, we elucidate the molecular interactions within the crystals that govern both the electronic origins and the intensity of their emission. 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