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2. List of U.S. state minerals, rocks, stones and gemstones

   en.wikipedia.org/wiki/List_of_U.S._state...

   In 1986, California named benitoite as its state gemstone, a form of the mineral barium titanium silicate that is unique to the Golden State and only found in gem quality in San Benito County. [80] ^ Colorado is the only state whose geological symbols reflect the national flag's colors: red (rhodochrosite), white (yule marble), and blue ...

3. Jet (gemstone) - Wikipedia

   en.wikipedia.org/wiki/Jet_(gemstone)

   Jet (gemstone) Jet is a type of lignite, [1] the lowest rank of coal, and is a gemstone. Unlike many gemstones, jet is not a mineral, but is rather a mineraloid. [2] It is derived from wood that has changed under extreme pressure. The English noun jet derives from the French word for the same material, jaiet (modern French jais ), ultimately ...

4. File:Map of Pennsylvania highlighting Columbia County.svg

   en.wikipedia.org/wiki/File:Map_of_Pennsylvania...

   English: This is a locator map showing Columbia County in Pennsylvania. For more information, see Commons:United States county locator maps. Date: 12 February 2006:

5. Colombian emeralds - Wikipedia

   en.wikipedia.org/wiki/Colombian_emeralds

   Colombia, located in northern South America, is the country that mines and produces the most emeralds for the global market, as well as the most desirable. It is estimated that Colombia accounts for 70–90% of the world's emerald market. [1] While commercial grade emeralds are quite plentiful, fine and extra fine quality emeralds are extremely ...

6. Gemstone - Wikipedia

   en.wikipedia.org/wiki/Gemstone

   Gemstone. Group of precious and semiprecious stones—both uncut and faceted—including ( clockwise from top left) diamond, uncut synthetic sapphire, ruby, uncut emerald, and amethyst crystal cluster. A gemstone (also called a fine gem, jewel, precious stone, semiprecious stone, or simply gem) is a piece of mineral crystal which, when cut or ...

7. 'Antiques Roadshow': diamond and ruby jewelry worth a fortune

   www.aol.com/news/2014-08-12-antiques-roadshow...

   The collection consisted of a ring, a pendant necklace and a bracelet that was worth a lot more than she expected. The appraiser said, "The ring with the fine ruby and the very very white diamonds ...