Could you define someone by a single memory? Nearly impossible. That's the beauty of charm bracelets - they allow for the plurality of remembrance, each charm a small yet significant moment in time. And you can load up as many as you want!
Etsy's Nostalgems offers "do-it-yourself" vintage-inspired charm bracelets. The pieces are themed, and can be expanded upon, adding your own momentos. Nostalgems also offers Dome Pendant Kits, which will hold your own precious pictures and transform them into unique jewelry. All you need is a pair of needlenose pliers.