.... It is supposed to be nearly pure silver. It was called ultra fine silver. It is pretty old. I wear it every day. Nothing has worn off and it looks like it did when I first got it.
The key point is that you do wear it every day. By doing this, you
are polishing it. If you left it in a drawer like your mom did with the 'good' silver, you'd have to polish it when you wanted to wear it.
A better reason to not have it made in silver is that silver is rather soft. Unless you planned to leave it on a shelf, its softness combined with the thin walls of the tube would really be asking for trouble. The scars from very small mishaps that happen every day would make it look old quite quickly.
I've been designing in metal for 25 years, mostly in aluminum. This experience gives me a pretty good feel for practicality. My vote would be the titanium. I might also want to look at carbon fiber but I don't know the material very well. Titanium's a real ..... to machine but you get the hardness of steel with the lightness of aluminum and it has a very nice color and sheen.
BTW: Many of my designs are here: <http://www.thetadigital.com/index.shtml>. I'm sending the link because some of the GG's design elements remind me of some of mine (wings, fonts, Greek references). Great minds.....;-)