There must be something wrong with this question! As far as I know, there is no research result to prove that the color of jadeite is formed by a single element. Especially green and purple, are usually composed of ... these elements, of which so-and-so element is the main element.

The color filter mentioned by the landlord should be Charles color filter. Color filter is a special kind of optical lens, which can only transmit red and some yellow-green light, but absorb other colors of light.

Different gems have different absorption spectra. The landlord can analyze the similarities and differences of these gem absorption bands, and maybe there will be an answer!

Because of the limited knowledge level, I can only answer so much! I hope I can help you!