This loupe is no good for gemstone use. The quality is appalling. I guess you get what you pay for. In this case, I got a good child's toy. Very disappointed.
I wish I had of discovered this little beauty years ago. I have ruined so many clothes over the years with shiny burn marks it's not funny. I bought this gadget and have never been more comfortable when ironing. I use it on everything. I've never ruined a piece of clothing since. I'm extremely grateful and cant believe it is on $1 including postage from China. Best dollar I've ever spent. Thank you, thank you, thank you.