Precious, semi-precious, or gem stones are found in nearly every State of the Union. The most important are enumerated below:
| Alabama | Beryl, blue and yellow; smoky quartz. |
| Arizona | Agatized wood, azur-malachite, turquoise, garnet, peridot. |
| Arkansas | Rock-crystal, smoky quartz, agate, diamond, novaculite. |
| California | Agate, benitoite, californite, diamond, gold quartz, tourmaline, abalone pearl, chrysoprase, kunzite, morganite. |
| Colorado | Beryl, aquamarine, phenacite, garnet, amethyst, agate, gold quartz, pyrite. |
| Connecticut | Beryl, yellow and green; rose quartz, tourmaline |
| Delaware | Pearl. |
| Florida | Chalcedony, conch pearl. |
| Georgia | Ruby, beryl, amethyst, gold quartz, garnet. |
| Idaho | Opal, agate, obsidian. |
| Illinois | Fluorite, pearl. |
| Indian Territory | Obsidian, pearl. |
| Indiana | Pearl. |
| Iowa | Fossil coral, pearl, chalcedony. |
| Kansas | Chalcedony. |
| Kentucky | Pearl. |
| Louisiana | Chalcedony. |
| Maine | Tourmaline, beryl, rose quartz, pearl, topaz, amazonite, smoky quartz, rock-crystal. |
| Maryland | Beryl, clam-pearl. |
| Massachusetts | Beryl. |
| Michigan | Agate, hematite. |
| Minnesota | Chlorastrolite, thomsonite, agate. |
| Mississippi | Pearl, chalcedony. |
| Missouri | Pearl, fluorite, pyrite. |
| Montana | Sapphire, beryl, smoky quartz, agate, amethyst, agatized wood, obsidian. |
| Nebraska | Chalcedony, pearl. |
| Nevada | Gold quartz, rock-crystal. |
| New Hampshire | Beryl, rock-crystal, garnet. |
| New Jersey | Fowlerite, willemite, prehnite, smoky quartz, agate, pearl. |
| New Mexico | Turquoise, garnet, obsidian, peridot, rock-crystal. |
| New York | Beryl, brown tourmaline, rose quartz, fresh-water pearl, clam-pearl, chondrodite. |
| North Carolina | Aquamarine, beryl, emerald, almandite garnet, rhodolite, prope garnet, diamond, cyanite, hiddenite, amethyst, ruby, sapphire, smoky quartz, rock-crystal, rutile. |
| North Dakota | Chalcedony, agate. |
| Ohio | Fossil coral, chalcedony. |
| Oregon | Agate, obsidian, hydrolite. |
| Pennsylvania | Amethyst, beryl, sunstone, moonstone, amazonite, almandite garnet, pyrope garnet, rutile. |
| Rhode Island | Hornblende in quartz, amethyst, rock-crystal. |
| South Carolina | Beryl, smoky quartz, rock-crystal. |
| South Dakota | Quartzite, beryl, agate. |
| Tennessee | Pearl. |
| Texas | Beryl, pearl, tourmaline. |
| Utah | Topaz, garnet. |
| Virginia | Amethyst, spessarite, garnet, beryl, moonstone, staurolite, allanite. |
| Vermont | Beryl, pearl. |
| Washington | Pearl, agate. |
| West Virginia | Rock-crystal. |
| Wisconsin | Agate, pearl. |
| Wyoming | Moss-agate, agate. |