dtf
·Yes but on these new ones I believe it is not glued on the glass, it is "integrated" within the glass so nothing one could heat and remove
I was thinking further on this, to make a magnifier, it must be a dent ground into the bottom of the sapphire? Sticking a lump on the bottom of the sapphire would shrink the date rather than make it bigger, like looking through the wrong end of a telescope?
high school physics was a long time ago, let me know if I’m wrong