Thanks for the advice Troy it is very much appreciated! I did submerge it in water with a tiny drop of dish soap as I didn’t think I had mineral oil to hand. I went to buy some there and apparently mineral oil is what I rub my chopping board with so I actually had it all along lol. It’s all a big learning curve for me, I’m a trained jeweller, ask me to make a ring no problem, ask me to identify a gemstone…….. not so good. That’s why I am on here working my way through tutorials 
image 1 was a bad attempt at photography through my grandads watch repairers loupe which is a big black tunnel. The next two were under the polariscope then the others under water with back light diffused light. I think I should have picked something easier to start out with.
Thanks
Ali