This paper is focused on the progress in the determination of water in glasses and melt inclusions with Raman spectroscopy. Using the presented “Comparator Technique” the water content of a sample is determined by simple comparison with a known standard. A calibration curve is not necessary. Furthermore, with this technique the water concentration in silicate melt inclusions can be determined without exposing the inclusions for measurements. This is very important for extremely water-rich melt inclusions, which would loose H2O on exposure.