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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. Rivière (jewellery) - Wikipedia

   en.wikipedia.org/wiki/Rivière_(jewellery)

   Rivière (jewellery) A rivière is a necklace consisting of one or more strings of linked gemstones. Usually only one kind of gemstone is used in a rivière, with all stones of the same colour and cut. The stones are either all the same size, or gradually increase in size towards the middle of the necklace. Rivières have been worn since the ...

4. Tanzanite - Wikipedia

   en.wikipedia.org/wiki/Tanzanite

   Pleochroism. Present, dichroism or trichroism, depending on heat treatment. Tanzanite is the blue and violet variety of the mineral zoisite (a calcium aluminium hydroxyl sorosilicate ), caused by small amounts of vanadium. [ 3] Tanzanite belongs to the epidote mineral group. Tanzanite is only found in Simanjiro District of Manyara Region in ...

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. 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. 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 ...

8. List of individual gemstones - Wikipedia

   en.wikipedia.org/wiki/List_of_individual_gemstones

   Logan Sapphire. Star of Bombay, given to Mary Pickford by Douglas Fairbanks, Sr. Star of India. Stuart Sapphire. Black Star of Queensland. Star of Adam, with a weight of 1,404.49 carats (280.898 g), it is the largest star sapphire in the world. Queen Marie of Romania Sapphire.

9. Archaeologists Uncovered a Mysterious Ancient Tablet With ...

   www.aol.com/archaeologists-uncovered-mysterious...

   The small piece of clay measures only 4.2 centimeters by 3.5 centimeters, it’s just 1.6 centimeters thick, and it weighs 28 grams. But despite its diminutive size, the tablet will help paint a ...