These multiple emission peaks from the handheld UV lamp can also affect the intensity of the fluorescence color observed. Figure 11B shows the fluorescence emission peaks from sample 7 (extracted from the 3D fluorescence spectra of its N3 center) at the same 365, 405, and 435 nm excitation energies used in the example above. Compared to 365 nm excitation, the fluorescence color with 405 nm excitation is almost twice as intense. The 435 nm excitation gives a relatively small emission peak centered at ~520 nm due to the presence of the H3 center, resulting in a weak green color. “Extra” emission from the conventional UV lamp at 405 nm causes the diamond’s blue fluorescence to be more intense than that from a “pure” 365 nm LED source. Such discrepancies contribute to problems with consistency and reproducibility of fluorescence observations within the industry.