Accessibility options

Switch to preferred accessibility theme:


Increase or decrease the text size:

  • Internet Explorer: View > Text Size > Largest

Keyboard navigation and access keys:

  • A - Accessibility options
  • 0 - Skip navigation
  • 1 - Home
  • 2 - Alexandrite chapters
  • 3 - Alexandrite directory
  • 4 - Alexandrite forums
  • 5 - Alexandrite gemstones
  • 6 - Alexandrite localities
  • 7 - Contact information
  • 8 - About Alexandrite Guide
  • 9 - Sitemap
  • Press ALT + Access Key, then ENTER.

Close

Alexandrite

Tsarstone collectors guide


Fluorescence

Fluorescence
A variety of luminescence. Certain materials display an effect of producing visible electromagnetic light, when irradiated by ultraviolet light, cathode ray or X-rays, or other forms of radiation of an appropriate wavelength. The emitted light has another form of energy different to absorbing light. The fluorescence phenomenon ceases immediately, when the source of ray is removed, if the effect continues after removal of the energy source it is then termed phosphorescence.

Be first to comment

600 characters left, NO HTML, Comments are moderated and will be posted if they are on-topic and not abusive.
Your e-mail will not be published, but must be valid. In order to reduce the amount of spam, we will send you an email message containing a link to confirm your comments publication. Unconfirmed comments will be not published and removed from our system within 3 days.
Please help us to prevent automated requests by entering the code shown in the picture box. Can´t read this image? Get new verification code
Close options details