Inside this 20,000 sq ft exhibition you can explore from the center of the Earth to the vast reaches of the solar system. See the sparkling highlights of the National Gem Collection, including the 168 ct Mackay emerald and diamond necklace and the massive Carmen Lúcia ruby (one of the largest rubies ever found). Learn how meteorites brought minerals to Earth. See lava and ash samples from three famous volcanoes. Explore gem and mineral specimens of every size, shape, and color of the rainbow.