8.0 on the Mohs scale.

Brazil, U.S., Sri Lanka (Ceylon), Myanmar (Burma), former USSR, Australia, Pakistan, Mexico, Tasmania, Japan, Africa. Topaz and citrine are the birthstones of the month of November.

Blue-violet with an diffusion treatment that creates a rainbow play of colors. There are a couple of patented processes that produce similar results.

Silver topaz (colorless), treated with a diffusion process to produce a permanent and stable beautiful blue-violet topaz with a play of colors.

More information on gemstone enhancements.

Peacock Topaz is a member of the Precious Topaz gemstone family.