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2. Diamond (gemstone) - Wikipedia

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

   Diamond[ a] is a gemstone formed by cutting a raw diamond. Diamonds are one of the best-known and most sought-after gems, and they have been used as decorative items since ancient times. The hardness of diamond and its high dispersion of light —giving the diamond its characteristic "fire"—make it useful for industrial applications and ...

3. 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 ...

4. List of diamonds - Wikipedia

   en.wikipedia.org/wiki/List_of_diamonds

   4 February Stone (The Art of de GRISOGONO) [ 3] 404.2. 163.41 [ 4] white. Angola. 27th largest white diamond found (at that time), and largest diamond from Angola, the 404 carats (80.8 g) 4 February diamond was found in early February 2016, and was cut into a 163 carats (32.6 g) flawless D-color emerald-shaped stone.

5. List of gemstones by species - Wikipedia

   en.wikipedia.org/wiki/List_of_gemstones_by_species

   5 Chatoyant gems. 6 Asterism. 7 See also. 8 References. 9 Further reading. Toggle the table of contents. ... Download as PDF; Printable version; In other projects ...

6. Jet (gemstone) - Wikipedia

   en.wikipedia.org/wiki/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 referring to ...

7. Diamond cut - Wikipedia

   en.wikipedia.org/wiki/Diamond_cut

   A diamond cut is a style or design guide used when shaping a diamond for polishing such as the brilliant cut. Cut refers to shape (pear, oval), and also the symmetry, proportioning and polish of a diamond. The cut of a diamond greatly affects a diamond's brilliance—a poorly-cut diamond is less luminous. In order to best use a diamond gemstone ...