The story behind the diamond donation

Want to write a good book? Start with this story: The Salvation Army is raffling off a donated diamond ring in time for Valentine's Day. Frankly, I'm not as interested in the ring as in the woman who walked into a donation center and told S.A. people to do something good with it.
Is she a jilted loved? Someone with better jewelry? A woman wanting to get rid of sad memories?
I'm very, very curious.