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


Diamond

Diamond
An isometric mineral, representing a naturally occurring crystalline form of pure carbon polymorphous with graphite, chaoite, and lonsdaleite and being the hardest substance known. Found in volcanic neck, volcanic pipe, and alluvial deposits. Cut into various forms and shapes, when free from flaws. Sometimes fluorescent under ultraviolet light. There are two distinct types of diamond; Type I, to which the majority of stones belong, which exhibits complete absorption beyond 300 nm, and Type II, the rare transparent type, which transmits light down to 225 nm. Its high dispersion makes it valuable as a gemstone. Diamond is ready subject to cleavage. Polycrystalline mineral variety and is crushed and used as an abrasive powder in drilling and cutting such as carbonado boart, ballas.

This section has no relevant content published at this time.

Close options details