Figure 1 shows broad scan spectra of pezzottaite and pink variety of beryl aka. morganite. Both gems have distinct Raman peaks at area 3500-3600 cm-1 caused by water molecules trapped in to channels of their crystal lattice. The peak at 3550 cm-1 distinguishes pezzottaite, it does not occur in beryl. Additionally,  pezzottaite tends to produce increasing general luminescence towards higher wave numbers. 

Figure 1: Broad scan (GemmoRaman-532nm) spectra of pezzottaite and beryl (shifted vertically for clarity)

Figure 2 shows the same spectra as above but zoomed into Raman fingerprint area between 250 and 1600 cm-1. While looking very similar at first glance, pezzottaite exhibits an distinct band at 1100 cm-1, which has not been observed in the Raman spectra of beryl. Automatic spectral matching algorithms of GemmoRaman-532 are typically powerful enough for making this separation but it's advisable to pay attention to this area whenever the result of beryl or pezzottaite are given.

Figure 2: Raman fingerprint zone (GemmoRaman-532) of pezzottaite and pink beryl (shifted vertically for clarity)