Look at semi-precious stones -- my wife and I decided on a matching pair of blue topaz stones, 'brilliance cut', and had a small jeweller make them into rings. (The jewelry chains offered very little choice, and were far more expensive too.)
Blue topaz has a hardness of 8 (i.e. very hard), and 5 years on the rings are still going strong, even though we're both quite rough with them. I guess we're about due for an upgrade though -- maybe peridot or tourmaline this time!
Slashdot Mirror
Blue topaz has a hardness of 8 (i.e. very hard), and 5 years on the rings are still going strong, even though we're both quite rough with them. I guess we're about due for an upgrade though -- maybe peridot or tourmaline this time!
Of course, if caffeine really does help prevent Alzheimers, the future for decaf may be black!