57769560_s_Facet_Rough___PrettyRock_com__Fact
[#] 18 [Myth] Only diamond can scratch glass. [Fact] 
Any gem material harder than glass at Mohs 5.5, can scratch it, quartz, tourmaline, topaz, garnet, sapphire, etc.
Gemology, Gem Rough,Gemology,Gem Identification Tools,Facet Rough - PrettyRock.com
Fact