See? Dilemma, there is absolutely no hope that this petal ring will ever fit on my fingers
The Plan? Grab a ring that DOES fit and place it above the loose ring (here I've gone for an adjustable heart ring in a gold tone. Yes.... just about the only rings that fit me are adjustable rings. So sad). It'll act as a barrier/barricade/stopper (you get the point)
Ta da! Now there's no hope of the ring falling off.
Simple, but works every time!