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  2. Sapphire - Wikipedia

    en.wikipedia.org/wiki/Sapphire

    Main sapphire-producing countries. Sapphire is a precious gemstone, a variety of the mineral corundum, consisting of aluminium oxide (α-Al 2 O 3) with trace amounts of elements such as iron, titanium, cobalt, lead, chromium, vanadium, magnesium, boron, and silicon.

  3. List of sapphires by size - Wikipedia

    en.wikipedia.org/wiki/List_of_sapphires_by_size

    National Museum of Natural History, Washington [8] Star of Artaban: Sri Lanka 287 carats (57.4 g) Star Blue-violet National Museum of Natural History, Washington [9] Star of Bombay: Sri Lanka 182 carats (36.4 g) Star Blue-violet National Museum of Natural History, Washington [10] Ruspoli Sapphire: 136.9 carats (27.38 g) [11] Stuart Sapphire ...

  4. Jewellery - Wikipedia

    en.wikipedia.org/wiki/Jewellery

    Fancy sapphires of various colours are also available. In the United States, blue sapphire tends to be the most popular and most affordable of the three major precious gemstones (emerald, ruby, and sapphire). Turquoise Turquoise is found in only a few places on Earth, and the world's largest turquoise-producing region is the southwest United ...

  5. Yogo sapphire - Wikipedia

    en.wikipedia.org/wiki/Yogo_sapphire

    Roughs from the English Mine were shipped to London and sold in Europe, often with claims they were sapphires from the Far East, while the American Mine had difficulty marketing its gems within the United States. The American Sapphire Company, which used local gemcutters from Great Falls, went bankrupt in 1909; a new firm, the Yogo American ...

  6. Gemstone - Wikipedia

    en.wikipedia.org/wiki/Gemstone

    Found all over the world, the industry of coloured gemstones (i.e. anything other than diamonds) is currently estimated at US$1.55 billion as of 2023 and is projected to steadily increase to a value of US$4.46 billion by 2033. [8] A gem expert is a gemologist, a gem maker is called a lapidarist or gemcutter; a diamond cutter is called a ...

  7. Stuart Sapphire - Wikipedia

    en.wikipedia.org/wiki/Stuart_Sapphire

    The Stuart Sapphire was on the front of the Imperial State Crown. The Stuart Sapphire is a blue sapphire that forms part of the British Crown Jewels.It weighs 104 carats (20.8 grams) and is believed to have originated from Asia, potentially present-day Afghanistan, Sri Lanka, Myanmar or Kashmir.

  8. History of the United States - Wikipedia

    en.wikipedia.org/wiki/History_of_the_United_States

    This is an accepted version of this page This is the latest accepted revision, reviewed on 24 December 2024. "American history" redirects here. For the history of the continents, see History of the Americas. Further information: Economic history of the United States Current territories of the United States after the Trust Territory of the Pacific Islands was given independence in 1994 This ...

  9. Ruby - Wikipedia

    en.wikipedia.org/wiki/Ruby

    Main ruby producing countries. Ruby is a pinkish red to blood-red colored gemstone, a variety of the mineral corundum (aluminium oxide). Ruby is one of the most popular traditional jewelry gems and is very durable. Other varieties of gem-quality corundum are called sapphires.