Ключевые слова: background, black, brown, cabochon, close, cobble, collection, crystal, crystalline, gem, gemmology, gemology, gemstone, geological, geology, green, hematite, iron, isolated, jewelry, macro, material, mineral, natural, nature, object, ore, ornamental, pebble, piece, quartz, red, rock, sample, semiprecious, set, shooting, small, specimen, stone, structure, surface, texture, textured, tumbled, up, various, white, yellow,