Ключевые слова: abstract, background, beauty, black, bright, carnelian, chalcedony, clear, close, closeup, color, cornelian, crystal, crystalline, decorative, gem, gemmology, gemology, gemstone, geological, geology, isolated, little, macro, material, mineral, natural, nature, onyx, orange, ornamental, precious, red, rock, sample, sard, semiprecious, shiny, shooting, silica, small, specimen, stone, structure, surface, texture, textured, transparent, white,