We spent countless of crystal stones specially ruby,amethyst and obsidian in crafting mythic item/gear. Please consider my suggestion. Thank You. 
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Converting mythic gear allows you to get 1 of the 2 most expensive mythstones used in creating the mythic back 
I also noticed I literally have thousands of the lower mythstones so I convert and salvage them for the use 375( with ascendant thing) mystones and get ultra rare drop