Related Overviews


'ruby' can also refer to...


More Like This

Show all results sharing these subjects:

  • Art
  • Chemistry


Quick Reference

The transparent red variety of the mineral corundum, the colour being due to the presence of traces of chromium. It is a valuable gemstone, more precious than diamonds. The finest rubies are obtained from Mogok in Burma, where they occur in metamorphic limestones; Sri Lanka and Thailand are the only other important sources. Rubies have been produced synthetically by the Verneuil flame-fusion process. Industrial rubies are used in lasers, watches, and other precision instruments.

Subjects: Art — Chemistry.

Reference entries