You'll be surprised to find out that pressure from your hand when wearing and taking off your ring that has gems on it can be the number one reason for gems to get loose!
When wearing or taking off your ring, always hold it from the sides where there's metal and no gems. This will also help keep your faceted stones such as diamonds and non-faceted gems such as turquoise and opal from getting dull because of the dirt that sticks to them from our finger tips!
For rings such as diamond eternity bands, which you can't avoid the diamonds, hold the surface of your diamonds gently and wiggle your ring out, never pull it off.
Enjoy your jewelry!