Blog - Grand Auctions


Tanzanite is the blue to violet transparent variety of the mineral zoisite and is named after the locality in which it was first discovered – Tanzania. Zoisite can also be found in pinks, yellows, greens and browns with many of these other colours turning blue to violet when heated to 300°C – 400°C. In fact heat treatment is now so wide spread that Tanzanite is assumed to be heated and this has little impact on price.

 Read More
  • Posted by Simon Rufus

Getting in Contact

What we do

Newsletter Sign-up




Captcha Image

Twitter