Blue

The most important and most requested color in the gemstone sapphire is blue. Here, the hue in this gem ranges from "cornflower blue" (a lighter blue) to "royal blue" (a deep ink blue). Sapphires with few inclusions are more common than, say, ruby. If you want to buy blue sapphire, make sure that the stone "lives" - that the stone sparkles, that there is a good interplay of intense color, a good cut, and as few inclusions as possible, with as high a carat count as possible. Just as legendary rubies come from Burma, the most famous sapphire site is the Kashmir region in India. The site that supplies the largest quantity today though is Sri Lanka.

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Facts

properties of tanzanite

  • Belongs mineralogically to zoisite
  • Hardness grade 6,5-7
  • Chemical formula: Ca2Al3(SiO4)3OH
  • Includes the colors blue, violet and brown
  • By heating it develops its famous blue color
  • Density from 3,29 - 3,4

origin

worth knowing

  • Only place of discovery: Tanzania
  • Tanzania locality was discovered in 1967
  • Was mineralogically known as "Zoisite" for a long time
  • Became known worldwide through the movie "Titanic"

Tanzanite as an investment

  • Rare, strongly increasing in value
  • finds become less, because there is only 1 mining area
  • rather bigger stones are preferable
  • Larger stones have higher increase in value
  • stones with deep blue color are to be preferred
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