Engagement, Marrige, and eternity. The eternity stands for married or love for all eternity. X
You can sell them to a jewelry store, or give them to a store that will sell them for you for a fee. You can sell them online, but shipping jewelry through the mail can be risky, due to loss or...
Yes the unbreakable circle of eternity, and Symbol of love, and perpetual joining of a Man and a Woman.
Wedding rings symbolise the love and fidelity. http://www.jewelocean.com/
They symbolise eternity - no beginning and no ending.