I have a fake set of standard rings/bracelets that look a lot like the real ones that I have, so that way I'm not too heartbroken if anything gets damaged or stolen when I'm traveling.
The CZs are made pretty well, and they're set in white gold, because I'm slightly allergic to silver. (Except for my piercings, which are SUPER sensitive.) I even have a fake set of earrings to wear because I'm scared of leaving one behind on the nightstand in a hotel.
My friend lost her wedding ring on her honeymoon because it fell down the drain! She took it off, set it on the side of the tub, (who knows for what reason) and accidentally knocked it into the tub that had an open drain. :cry: The hotel was nice enough to actually have someone sort through the sewage pipe to hopefully find it but unfortunately it wasn't recovered.
My mom also had a friend who took off her ring in a restaurant bathroom while traveling. (Don't know why she took it off...) She set it down on the counter and walked away, forgetting the ring!!


Of course when she remembered and went back, someone had taken it.
After hearing these stories (and knowing how forgetful I am), I got a cz set for traveling. The one that I mainly wear is a band with 2 TCW of little diamonds set all around, and I'll add nicer ones if I know I'll be doing. Just like daluu said, dont' want to attract too much attention in sometimes because a robbery is still a robbery!
My other trick is that if I'm wearing a blingy diamond to somewhere nice, but I may encounter some scary situations, is just to swivel the diamond in towards my palm and close my hand into a fist, that way it looks like I'm just wearing a plain band.

Then when I want to be blingy, presto! I swivel the diamond out and I'm looking good! (I do this often on the subway with my 3CT pear-shaped diamond.)