topaz is correct. I know topaz is mostly found in brown, yellowish colors but my amber uses these colors, so i thought that blue topaz would give the best contrast.
Also i thought about the best thing s associated with the colors
blue = air, water, speed, calmness and so on
red = health, anger, rage, damage, fire
green = nature, earth, plants, poison
white = pure, clear, sparkling, hardest material
yellow / brown = .....
the amulet is undefined because the function of a buff is not there and the recipe is worked out for testing. Needs nothing special and can be crafted at level 0
i will change that if i get this buff to be cast when the amulet is worn. Also the problem is that the amulet is not shown in the equipment table of the worker
ATM i cannot figure out which buff_script is usable for buffing on self only