Ключевые слова: beautiful, chalcedony, concept, creative, crystalline, decorative, design, flint, gem, gemmological, gemmology, gemological, gemology, gemstone, geological, geology, geometric, gray, hexagon, hexagonal, honeycomb, isolated, jewelry, material, mineral, mineralogy, natural, nature, object, ornamental, pattern, piece, pink, quartz, raw, rock, rough, science, scientific, sedimentary, semiprecious, shape, specimen, stone, structure, surface, texture, textured, white,