Hi Chris I appreciate that thanks.
I have attached a word doc and some extracts, the photo of an imperial Topaz at the top, I believe was what they originally classed the colour as but now it seems as long as it is either pink, orange, red or purplish they deem it to be imperial
yours seems to be light pinkish with a reddish hue??? I would say it could be classed now days as imperial. But at the end of the day it all depends on the person appraising it, you could go to 3 different appraisers and get 2 or 3 different answers