. . . "Gemstones of America"@en . "Gemstones of America" . . . "A look at how gems are mined and crafted into jewelry and a tour of the Gem and Mineral Collection at the Smithsonian Institution." . "Learn how the Earth's crystals are formed and why they are so rare. Journey to the richest mines in the United States and learn how gems are mined and crafted into spectacular jewelry. Discover the world's rarest, and most alluring gems as you're taken into the vaults and the high security room of the Gem and Mineral Collection at the Smithsonian Institution."@en . . . . . . . . . "Efrem Zimbalist Jr. tours several gem mining sites throughout the U.S., featuring the unique qualities of the various deposits, the mining techniques, and the gem processing operations. The nations finest jewels are finally seen on display at the Smithsonian Museum in Washington, D.C." . . . . . . . . . . . . . . . "Nonfiction films"@en . . . . . . "STS Productions." . . . . "National Museum of History (U.S.)" . .