This is an icosahedron, one of the sacred geometries. It is made up of 20 equilateral triangles. The energy of the icosahedron represents "water" among the four elements (water, fire, earth, wind). It symbolizes kindness, love, relationships, and emotions. I purchased it at a crystal shop about 2-3 years ago for 3,000 yen each, totaling 12,000 yen.