Ключевые слова: black, brown, cabochon, cairngorm, chalcedony, crystal, crystalline, cut, gem, gemology, gemstone, geode, geology, green, jewel, jewelry, marcasite, mineral, mineralogy, natural, ore, ornamental, pebble, precious, quartz, raw, rock, rosequartz, semi precious stone, semiprecious, smoky, smokyquartz, specimen, stone, texture, translucent, transparent paper, tumbled,