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About Blue Topaz

By irradiation with electrons, gamma rays or neutrons colourless topaz is modified to blue colours.
Radioactivity is only produced when irradiating with neutrons. Generally, topazes change to greenish-brown colour by irradiation and subsequently turn to blue by heat treatment. Gamma rays and electrons normally produce light blue colours ("sky blue"). Neutrons cause blue colours of higher intensity (e.g. "London Blue"). Combination techniques extend the blue colour variation, e.g. neutron plus electron bombardment produces the so-called "Swiss blue".

There exist also blue topaz gemstones naturally occurring in a light blue colour. They were irradiated by nature, not artificially. Though, artificially irradiated stones have such low values of radioactivity they do not harm humans in any way.

Facts:

  • Mineral: Topaz
  • Mohs Hardness: 8.0
  • Specific gravity: 3.53 g/cm³
By irradiation with electrons, gamma rays or neutrons colourless topaz is modified to blue colours. Radioactivity is only produced when irradiating with neutrons. Generally, topazes change to... read more »
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About Blue Topaz

By irradiation with electrons, gamma rays or neutrons colourless topaz is modified to blue colours.
Radioactivity is only produced when irradiating with neutrons. Generally, topazes change to greenish-brown colour by irradiation and subsequently turn to blue by heat treatment. Gamma rays and electrons normally produce light blue colours ("sky blue"). Neutrons cause blue colours of higher intensity (e.g. "London Blue"). Combination techniques extend the blue colour variation, e.g. neutron plus electron bombardment produces the so-called "Swiss blue".

There exist also blue topaz gemstones naturally occurring in a light blue colour. They were irradiated by nature, not artificially. Though, artificially irradiated stones have such low values of radioactivity they do not harm humans in any way.

Facts:

  • Mineral: Topaz
  • Mohs Hardness: 8.0
  • Specific gravity: 3.53 g/cm³
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Blue topaz, london blue, cabochon, pyramid, antique shape, 18x13 mm Blue topaz, london blue, cabochon, pyramid,...
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018378_Blautopas_14x11mm Blue topaz sky blue, heart shape, faceted,...
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032845_Blautopas_20x15mm Blue topaz sky blue, engraved, Buff Top, oval,...
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022702_Blautopas_Bergkristall_10.5x10.5mm Doublet with Rock crystal and Blue topaz swiss...
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032042_Blautopas_10.5x10.5mm Blue topaz sky blue, button, faceted, antique...
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033225_Blautopas_10.5x10.5mm Blue topaz swiss blue, button, faceted, antique...
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032041_Blautopas_10.5x10.5mm Blue topaz sky blue, button, faceted, antique...
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032040_Blautopas_10.5x10.5mm Blue topaz sky blue, button, faceted, antique...
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022701_Blautopas_Bergkristall_10.5x10.5 Doublet with Rock crystal and Blue topaz sky...
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023595_Blue-topaz_22x17mm Blue topaz london blue, engraved, Buff Top,...
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Blue topaz, swiss blue, briolette, faceted, antique, 13x13 mm Blue topaz, swiss blue, briolette, faceted,...
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000439_Blautopas_13x13mm Blue topaz, london blue, briolette, faceted,...
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