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  2. Topaz - Wikipedia

    en.wikipedia.org/wiki/Topaz

    Topaz is a silicate mineral made of aluminum and fluorine with the chemical formula Al 2 Si O 4 (F, OH) 2.It is used as a gemstone in jewelry and other adornments. Common topaz in its natural state is colorless, though trace element impurities can make it pale blue or golden brown to yellow-orange. [7]

  3. List of individual gemstones - Wikipedia

    en.wikipedia.org/wiki/List_of_individual_gemstones

    Emerald of Saint Louis, [5] 51.60 carats cut; discovered in Austria, probably Habachtal, resides in the National Museum of Natural History, Paris; Gachalá Emerald [6] Mogul Mughal Emerald, 217.80 carats cut; mined in Colombia and cut in the Mughal empire in Hijri year 1107 (1695–1696), resides in the Museum of Islamic Art, Doha, Qatar [7] [8]

  4. Jewels of Elizabeth II - Wikipedia

    en.wikipedia.org/wiki/Jewels_of_Elizabeth_II

    Cullinan III and IV are two of several stones cut from the Cullinan Diamond in 1905. The large diamond, found in South Africa, was presented to Edward VII on his 66th birthday. Two of the stones cut from the diamond were the 94.4-carat (18.88 g) Cullinan III, a clear pear-shaped stone, and a 63.6-carat (12.72 g) cushion-shaped stone.

  5. Gemstone - Wikipedia

    en.wikipedia.org/wiki/Gemstone

    A few gemstones are used as gems in the crystal or other forms in which they are found. Most, however, are cut and polished for usage as jewelry. The two main classifications are as follows: Stones cut as smooth, dome-shaped stones called cabochons or simply cab. These have been a popular shape since ancient time and is more durable than ...

  6. Emerald - Wikipedia

    en.wikipedia.org/wiki/Emerald

    Emerald is a gemstone and a variety of the mineral beryl (Be 3 Al 2 (SiO 3) 6) colored green by trace amounts of chromium or sometimes vanadium. [2] Beryl has a hardness of 7.5–8 on the Mohs scale . [ 2 ]

  7. French Crown Jewels - Wikipedia

    en.wikipedia.org/wiki/French_Crown_Jewels

    Crown Jewels of France, on display at the Louvre with the crown and diadem of Empress Eugénie to the left, the set of Queen Marie Amélie in the centre, and the crown of Louis XV to the right with the diadem of the Duchess of Angoulême The Côte-de-Bretagne red spinel with the set of Queen Marie Amélie to the left, the bracelets and diadem of the Duchess of Angoulême in the centre and ...