Huh, just noticed, and looking back, both of the teachers wear rings on their right hand ring finger, but only when they're not at work.
Women wear engagement rings on left ring finger just like in Western countries. They also wear wedding rings on left ring finger AFTER the wedding ceremony is OVER,
HOWEVER
There is also the custom of wearing the wedding ring on the right ring finger - as they are doing - before the ceremony.
Make of that what you will.