 | Arizona is the top gem producer in the United States. Arizona is a producer of turquoise, peridot and petrified wood. Gemstones like azurite, chrysocolla and malachite are associated with Arizona's copper deposits. Agate, amethyst, garnet, jade, jasper, obsidian, onyx, and opal have all been found in Arizona. |  |
 | Rubies, sapphires and emeralds can be found in North Carolina although not concentrated enough to support a large gemstone industry. Gem materials in North Carolina include aquamarine, beryl, citrine, emerald, garnet, moonstone, rose quartz, ruby, sapphire, smokey quartz, staurolite, topaz, and tourmaline. |  |
 | Oregon produces some of the best feldspars in the world. Small mining operations have become famous for producing "Oregon Sunstone," a transparent feldspar that contains tiny copper platelets aligned in a common orientation. As a sunstone is tilted in the light, these platelets simultaneously reflect a flash of light. Oregon produces other gem materials including the famous "thunderegg" a geode that is ugly on the outside but often filled with chalcedonly, opal or crystals that can be cut into gemstones. |  |
 | Utah produces a wide variety of gemstones. Amethyst, garnet, jasper, agate and opals are found at numerous locations in Utah. Although topaz is Utah's state gemstone, the gemstone that is getting a lot of attention is the very rare red beryl, also known as bixbyite. |  |
 | California is widely known for its tourmaline and turquoise production. Native Americans were the first to treasure these minerals, and a commercial gemstone industry was active by the late 1800s. The tourmaline deposits of Riverdale and San Diego Counties have supplied more tourmaline for cutting and mineral specimens than any other tourmaline deposits in the northern hemisphere. California gemstones also include many varieties of agate, jasper, jade, garnet and quartz. The state is one of the world's only sources of benitoite, a blue barium titanium silicate, and it has been named the state gemstone. |  |
 | Montana's most popular gemstone product is sapphire. Yogo Gulch sapphires have been famous for over 100 years, and the production of sapphire continues today. Sapphires are produced from both rock and alluvial deposits. They occur in a wide range of colors which include blue, blue-green, green, pink, pale red, purple, yellow, and orange. Many parts of Montana boast agate and jasper. One of the most popular is 'Montana Moss Agate' |  |
