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Arizona Spinel is actually a garnet and not a ruby.
Arkansas Diamond is actually a rock crystal, the purest form of quartz and considered a semi-precious stone. It is transparent and often faceted in the likeness of diamonds.
Arizona Spinel: A garnet found in Arizona that resembles a spinel.
Arkansas Diamond: Not a real diamond but a form of clear rock crystal.
Arkansas Stone: An abrasive used to smooth metals in jewelry making.
Arizona spinel
An Arizona spinel is actually a garnet (and not a spinel at all).
Arkansas diamond
An Arkansas diamond is actually a rock crystal (and not a diamond at all).
Arizona spinel, Sapphire spinel and Kandy spinel
Lab created stones
Almandine spinel, Aqua gem, Zircon spinel, Rozircon, Azurite ...
aka Arizona Ruby, Arizona Spinel, Australian Ruby, Black Hills Ruby, Bohemian Ruby, Montana Ruby, Mountain Ruby, New Mexico Ruby, Rocky Mountain Ruby ...
In the Middle Ages, the red garnet was also called the 'carbuncle stone'. And even today, fantasy names like Arizona ruby, Arizona spinel, Montana ruby or New Mexico ruby are still rife in the trade.
 See also: Jewel, Gemstone, Spinel, Garnet, Diamond
  
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