Ключевые слова: agate, amorphous, arrangement, attraction, beryl, calcite, chemical, citrine, cleavage, cohesion, compress, diamond, emerald, endless, facete, fluorite, formation, fracture, gemstone, geometric, geometry, granite, growth, hardness, harmony, hexagon, iolite, luminous, magnetism, mineral, molecule, multi, nature, opal, pentagon, perfect, pressure, purity, quiet, rarity, reflection, ruby, sapphire, silica, structure, surface, symmetry, texture, topaz, zircon,