I have a question I need answered, I'd like to have an understanding of "Saint Medals"...
For clarification... I din't answer earlier, because "medals" don't play a role in my life... but I will give ya what I know.
I would like to know WHY they are worn,
This varies from person to person... could simply be a fashion choice, a cultural thing, or it could be meaningful to the wearer.
what it means to those who wear them and the signifigance of them.
Again, varies.... from a physical reminder of a spiritual reality --- to those who believe certain medals gain them "extraordinary graces" from God.

Why are they blessed by a priest, and what does that denote to the medal.
Are they called "Holy Medals"?
Medals fall under what is properly called "sacramentals"
Feel free to read about them :
http://www.scborromeo.org/ccc/p2s2c4a1.htm#1667Why would one give one to someone.
(broken record, sorry) Reasons vary, from a kind gesture to an attempt to "save" or "convert"....
I gave one to my friend's son at his First Communion... but even my Jewish mother gave one as well --- it is kinda the thing to do for a religious occasion like that.
And would you give one to someone who was not Catholic and why if the answer is yes.
I wouldn't .... unless I was giving it simply as jewelry to someone I knew had a affinity for religious items.
At least you'll be able to read the backround about sacramentals before another Catholic who has more experience with these things posts on the thread.
Peace,
S