Chatty, I believe these happenings and or visions come to those who have truly loved with their whole being. I believe through this love, we remain united after death.
I don't mean to say, those who have loved their lost ones and haven't experienced a sign or vision didn't truly love them. I think it is a combination of love and allowing it to happen.

I bet the charm, you found, is the most special one of all. What a beautiful heart warming story.
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A friend is a gift you give yourself.
-- Robert Louis Stevenson