On the surface, the sentiment is lovely. However, it bothers me a bit that many of these rings are given/will be given as gifts.
Teenage girls (and boys, for that matter) often want to "try their wings" i.e., they may wear them as an experiment-or even as a mockery of the sentiment!
So, I'd advise parents, grandparents, aunts, uncles, older siblings, and other family members to talk over their intentions with the intended recipients, reassuring themselves that the gifts will be accepted in the spirit with which they are given. Also, as further assurance, they could offer to pay for any engraving, or at least be the one to order the gift. One should always make sure, as much as possible, that a sentiment from God NOT be mocked!