The ATF definition of a destructive device includes the following caveat: The term "destructive device'' shall not include any device which is neither designed nor redesigned for use as a weapon
Just a tip, since both you and your gal will be wearing this ring (ideally) for the rest of your lives, you should involve her in picking hers, and pick one that you like too. I chose a Tungsten-Carbide ring because I liked the color. My wife picked hers out for herself. This arrangement is optimal since it lessens the chance for the requirement to upgrade or replace the ring later on when you decide that you don't care for the look of the ring your significant other selected. By the way, my wife selected a diamond band in platinum... ouchy on price, but it makes her happy.
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The ATF definition of a destructive device includes the following caveat: The term "destructive device'' shall not include any device which is neither designed nor redesigned for use as a weapon
If the equations are on a blackboard, whiteboard, or projector screen, try using a digital camera... After all, a picture is worth a thousand words.
Just a tip, since both you and your gal will be wearing this ring (ideally) for the rest of your lives, you should involve her in picking hers, and pick one that you like too. I chose a Tungsten-Carbide ring because I liked the color. My wife picked hers out for herself. This arrangement is optimal since it lessens the chance for the requirement to upgrade or replace the ring later on when you decide that you don't care for the look of the ring your significant other selected. By the way, my wife selected a diamond band in platinum... ouchy on price, but it makes her happy.