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Braganza Gemstone
The braganza is a huge gemstone that may or may not be a diamond. This Portuguese stone is said to weigh 1680 carats (which would make it the largest-known diamond), but it has not been authenticated.
Weighing 1,680 carats, the huge Braganza gemstone mounted into the Portuguese crown jewels was originally thought to be a diamond—in fact it is a beautiful clear topaz.
 See also: Diamond, Mount, Quartz, Silicate, Titanium
  
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