+3 GIA (Gemological Institute of America) often labels rocks like natural black diamonds (Carbonado) or sedimentary rocks containing large amounts of carbon as "amorphous carbon rock." Below are the specific details deciphering this term: Nature of the rock: This is a polycrystalline natur...
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Amorphous carbon is a type of carbon that lacks a crystalline structure like diamond or graphite. In nature, it exists as rocks such as coal and carbonado (black diamond). If GIA certified, it is usually a polycrystalline diamond or a treated material. Below are the types of natural carbon gemstones...