SHUNGITE is a stone composed in majority of carbon its hardeness is only 2,5 / 3 on the Moss scale, this mean that is quite a fragile stone.
Black shungite when polished gives a nice brilliant metallic shine. When you wear shungite jewellery it is possible that the shining surface fades with time. Do not care, the important fact is that the energetics propertis stay inchanged!
Remember that shungite is the unique stone that never charge with negative energy.!