The precious category usually includes all those rare pink and black gem, which are distinguished by their amazing beauty, most often acquired as a result of special processing. The most famous stones in this category are diamonds and corundum.
Semi-precious stones, in turn, include the popular pink and black gem, which are not classified as precious gems. Such minerals are not rare, which explains their reasonable cost.
The third category (ornamental) includes pink and black gemstone and rocks that have no value but are actively used in the manufacture of jewelry, souvenir, and stone-cutting products. Items made of the pink and black gemstone are characterized not only by an attractive appearance but also by a very affordable price.