The most definitive testing method for the filled jadeite jade is infrared spectroscopy, because the presence of 3 036 and 3 058 cm^-1 peaks is characteristic of polymer impregnation. The rule applies to the filled quartzite. In the past years there emerged many filled gems such as aquamarine, tourmaline, garnet and feldspar. The experts identified filled gems according to the two peaks due to polymer. However, the authors note that many minerals have the peaks or bands from 3 100 to 3 000 cm^-1 of the FTIR absorption spectra and many gemstones absorb all the infrared light in that frequency range, so the peaks due to polymer might be covered up. The authors also warn that the gems impregnated with inorganic material would not present the absorbance from 3 100 to 3 000 cm^-1. Therefore, whether the FTIR spectra show the absorbance peaks at 3 036 and 3 058 cm^-1 or not, it is not the only, conclusive evidence that indicates whether the gems are filled or not. Different gems can't be compared absolutely with each other.