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 tourmaline

  • Separate mineralogical group with many varieties
  • Hardness grade 7 - 7,5
  • Chemical formula: XY3Z6(T6O18)(BO3)3V3W(V, W, X, Y, Z stand for different possible elements)
  • Includes all colors
  • Colored by different metal oxides
  • Specific gravity 2.8 - 3.3 g/cm3

origin

  • Brasilia
  • Madagascar
  • Pakistan
  • Various locations in Europe
  • Mozambique
  • Namibia
  • Nigeria

worth knowing

  • Oldest known locality in modern trade: Brazil
  • Occurs in all colors
  • Forms beautiful crystals with very good crystal endings
  • Various esoteric and healing meanings
  • Also large crystals and large cut stones possible
  • The locality Pakistan was discovered only around 2010

investment in tourmaline

  • Still undervalued compared to other gemstones.
  • Exception: the Paraiba tourmaline, which can be more expensive than sapphire
  • Stones should be at least 5 ct in weight, except for Paraiba
  • Larger stones have higher appreciation
  • Experts calculate 6 - 8% increase in value per year
  • Beautiful, pure stones with clear colors are preferable
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