Many different gemstones are produced in Colorado. These include aquamarine, amazonite, garnet, topaz, tourmaline, lapis lazuli, quartz, smoky quartz, rhodochrosite, rose quartz, amethyst, turquoise, peridot, sapphire, zircon, agate, and jasper. A rough diamond from Colorado was cut into a 16.87-carat stone. It is the largest cut diamond ever produced from United States rough.

Aquamarine is the state gemstone of Colorado, and it is mostly found at high elevations on Antero Mountain. Rhodochrosite is the state mineral, and many specimens are cut into gemstones such as the stone shown here from the Sweet Home Mine.