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2. List of individual gemstones - Wikipedia

   en.wikipedia.org/wiki/List_of_individual_gemstones

   A number of individual gemstones are famous in their own right, ... reported to be the largest and most valuable gem opal ever found; Pearls Abernathy Pearl ...

3. Gemstone - Wikipedia

   en.wikipedia.org/wiki/Gemstone

   Many gems are crystals which are classified by their crystal system such as cubic or trigonal or monoclinic. Another term used is habit, the form the gem is usually found in. [12] For example, diamonds, which have a cubic crystal system, are often found as octahedrons. [13] Gemstones are classified into different groups, species, and varieties.

4. List of gemstones by species - Wikipedia

   en.wikipedia.org/wiki/List_of_gemstones_by_species

   This is a list of gemstones, organized by species and types. Minerals. There are over 300 types of minerals that have been used as gemstones. Such as: A–B

5. 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 ...

6. Crater of Diamonds State Park - Wikipedia

   en.wikipedia.org/wiki/Crater_of_Diamonds_State_Park

   Crater of Diamonds State Park is known for the 37.5-acre (15.2 ha) plowed field on which visitors can hunt for diamonds and other semi-precious gems. On average, two diamonds are found per day by park visitors. [3] A visitor center contains information about the geology of the park, a gift shop, and a cafe.

7. Peridot - Wikipedia

   en.wikipedia.org/wiki/Peridot

   Peridot can be found in mafic and ultramafic rocks occurring in lava and peridotite xenoliths of the mantle. The gem occurs in silica-deficient rocks such as volcanic basalt and pallasitic meteorites. Along with diamonds, peridot is one of only two gems observed to be formed not in Earth's crust, but in the molten rock of the upper mantle. [1]

8. Gemstone industry in Greenland - Wikipedia

   en.wikipedia.org/wiki/Gemstone_industry_in_Greenland

   Gemstones have been found in Greenland, including diamond, ruby, sapphire, kornerupine, tugtupite, lapis lazuli, amazonite, peridot, quartz, spinel, topaz, and tourmaline. [1] Most of Greenland's ruby and sapphire occurrences are located near the village of Fiskenaesset/ Qeqertarsuatsiaat on the southwest coast.

9. Ammolite - Wikipedia

   en.wikipedia.org/wiki/Ammolite

   Ammolite is an opal-like organic gemstone found primarily along the eastern slopes of the Rocky Mountains of North America.It is commonly unearthed by natural erosion or through the process of various mining practices, within the perimeter of an ancient sea bed called the Western Interior Seaway. [2]