I think on balance, more people actually use the right hand than the left for wedding rings.
DT cross...what looks like bad table manners to us is, in fact quite acceptable in chinese socierty. chopsticks have an etiquette all of they're own. EG. You should never 'cross' them on your plate when you've finished, but always use the little stand for them at the side. you should never 'feed' anybody a morsel with your own chopsticks, but offer your bowl for them to take, you should never use your chopstick(s) to point at anybody, or 'stab' at food. To hold your bowl of rice under your chin and to shovel it in, is, in fact the correct way to eat rice.