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2. 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 ...

3. Ammolite - Wikipedia

   en.wikipedia.org/wiki/Ammolite

   It was designated the official gemstone of Lethbridge, Alberta, Canada in 2007, [ 2][ 3] and was subsequently designated as Alberta's official gemstone in April 2022. [ 4] Ammolite is also known as aapoak ( Kainah for "small, crawling stone"), gem ammonite, calcentine, and korite. The latter is a trade name given to the gemstone by the Alberta ...

4. Sugilite - Wikipedia

   en.wikipedia.org/wiki/Sugilite

   Sugilite (/ ˈ s uː ɡ ə l aɪ t,-dʒ i-/ SOO-gə-lyte, -⁠jee-) [2] [3] is a relatively rare pink to purple cyclosilicate mineral with the complex chemical formula K Na 2 (Fe, Mn, Al) 2 Li 3 Si 12 O 30. Sugilite crystallizes in the hexagonal system with prismatic crystals. The crystals are rarely found and the form is usually massive.

5. 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 ...

6. Napoleon Diamond Necklace - Wikipedia

   en.wikipedia.org/wiki/Napoleon_Diamond_Necklace

   The Napoleon Diamond Necklace is somewhat atypical of other contemporary works produced by Marie-Étienne Nitot. [1] Other pieces commissioned from him by Emperor Napoleon, such as the two parures celebrating the Emperor's marriage to Archduchess Marie Louise of Austria, the Marie Louise Diadem, the wedding jewels for Empress Joséphine, etc., all demonstrate a predilection for highly ...

7. Affair of the Diamond Necklace - Wikipedia

   en.wikipedia.org/wiki/Affair_of_the_Diamond_Necklace

   The Affair of the Diamond Necklace ( French: Affaire du collier de la reine, "Affair of the Queen's Necklace") was an incident from 1784 to 1785 at the court of King Louis XVI of France that involved his wife, Queen Marie Antoinette . The Queen's reputation, already tarnished by gossip, was further sullied by the false accusation that she had ...