57769560_s_Facet_Rough___PrettyRock_com__Fact
[#] 3 [Myth] All gemstones have an absorption spectra. [Fact] 
Most clear stones tend not to have an absorption spectra, or it is so fine as to be unreadable with handheld tools.
Gemology, Gem Rough,Gemology,Gem Identification Tools,Facet Rough - PrettyRock.com
Fact