Coral is the skeleton of many small marine organisms that comprise a colony. These organisms are polyps, each a few millimeters in size. When a new polyp is born, it attaches its skeleton to the colony and thus expands it. In coral colonies, along with the polyps, some single-celled algae coexist, which photosynthesize and supply food to the polyps, and at the same time secrete pigments that color the colonies, i.e. the corals. Corals can appear in a wide variety of colors such as pink-red, beige, white, as well as black (Yusuri). It is supposed to fend off negativity and enhance sexuality.
Amber is a fossilized resin from pines and other conifers that are several thousands to millions years old. Although it is not a stone, but a hardened resin, it is used as a gemstone for the manufacture of jewelry and other decorative objects. Due to its beneficial properties it has been treasured as one of the most popular gemstones since ancient times.