As previously told, here we will consider the RRUFF Raman data of REO glass standards, which are courtesy of Elizabeth Cairns, University of Edinburgh. We consider the broad scans from 0 to 6000 cm -1 . "The area from 0 to about 1600 cm -1 is the so-called Raman "fingerprint zone". The spectral pattern of this area reflects a fingerprint enabling the identification of a material, just as a fingerprint enables the identification of a person. This is also the area in which most Raman signals of inorganic solids occur". Usually, spectra are recorded "only across fingerprint zone, … Fingerprint spectra are also typically background corrected. This means any slope generated by luminescence has been subtracted from the spectrum. Background correction prepares the data for the computer to find the peak locations and match them against a library containing spectra of known materials" (GemmoRaman, 2012). "The extended area from 0 to about 3000-6000 cm -1 (depending on spectrometer) is called a broad scan area. Broad scan contains both Raman fingerprint zone and an extended range for photoluminescence studies. The line between the zones is not very distinct. Photoluminescence reactions do occur at both areas and sometimes mix with or overwhelm any Raman signals. … For gemology it is advisable to pay attention to luminescence as much as Raman signals, because it often contains important information about chromophores (such Cr) and rare earth elements (REE)" (GemmoRaman, 2012).