This has the best of both worlds. Gibeon meteorite, which is as old as the Earth at over 4 billion years old, and a contemporary space age metal to house it in. Add to that the ultimate personalization; your own fingerprint or one from the one you love.
A print of your finger can be made by using an ink pad or thin paint and pressing lightly on a piece of blank paper. A digital picture of a high resolution can be e-mailed or the print can be physically mailed to me to photograph.