Spectroscope is always excellent for identification, with rough and cut material, will not tell you if it is treated or synthetic (but usually a synthetic gem spectrum is too good) but you have a diagnostic ID straight away with a lot of gems sapphire, ruby, garnet, peridot, chrysoberyl, spinels mainly blue and red, pink red tourmaline, glass in some colours, the spectroscope is not easy to use but if you can master it, it is a great help in the field