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2. Kyanite - Wikipedia

   en.wikipedia.org/wiki/Kyanite

   Kyanite is a typically blue aluminosilicate mineral, found in aluminium-rich metamorphic pegmatites and sedimentary rock. It is the high pressure polymorph of andalusite and sillimanite, and the presence of kyanite in metamorphic rocks generally indicates metamorphism deep in the Earth's crust. Kyanite is also known as disthene or cyanite. [5]

3. Lapis lazuli - Wikipedia

   en.wikipedia.org/wiki/Lapis_Lazuli

   Lapis lazuli (UK: / ˌ l æ p ɪ s ˈ l æ z (j) ʊ l i, ˈ l æ ʒ ʊ-,-ˌ l i /; US: / ˈ l æ z (j) ə l i, ˈ l æ ʒ ə-,-ˌ l i /), or lapis for short, is a deep-blue metamorphic rock used as a semi-precious stone that has been prized since antiquity for its intense color.

4. Diamond color - Wikipedia

   en.wikipedia.org/wiki/Diamond_color

   Fancy-colored diamonds such as the deep-blue Hope Diamond are among the most valuable and sought-after diamonds in the world. In 2009, a 7-carat (1.4 g) blue diamond fetched the then highest price per carat ever paid for a diamond when it was sold at auction for 10.5 million Swiss francs (US$9.5 million at the time) which is in excess of US$1.3 ...

5. Ocean Dream Diamond - Wikipedia

   en.wikipedia.org/wiki/Ocean_Dream_Diamond

   The Ocean Dream is a diamond, measuring 5.51 carats (1.102 g), and rated in color as Fancy Deep Blue-Green by the Gemological Institute of America. [1] The Ocean Dream is the first and one of the only natural diamonds known to the GIA to possess a blue-green hue (besides the Ocean Paradise Diamond owned by the Nahshonov Group, found in Brazil in 2012), making it one of the rarest diamonds in ...

6. Gemstone irradiation - Wikipedia

   en.wikipedia.org/wiki/Gemstone_irradiation

   Gemstone irradiation is a process in which a gemstone is exposed to artificial radiation in order to enhance its optical properties.High levels of ionizing radiation can change the atomic structure of the gemstone's crystal lattice, which in turn alters the optical properties within it. [1]

7. List of gemstones by species - Wikipedia

   en.wikipedia.org/wiki/List_of_gemstones_by_species

   Calcite. Manganoan calcite (var.); Caledonite; Canasite; Cancrinite. Vishnevite; Carletonite; Carnallite; Cassiterite; Catapleiite; Cavansite; Celestite; Ceruleite ...