Ключевые слова: aggregate, amethyst, background, beautiful, blue, brush, classic, closeup, collection, colored, crude, crystallization, crystals, decorative, fine, gem, gemology, gemstone, geological, geology, jewel, jewelry, mineral, mineralization, mineralogy, mining, natural, nature, object, pebble, precious, quartz, raw, rock, rough, science, stone, texture, uncut, white, wild,