The dirt is actually from a meteorite found in North West Africa which originated from Mars. Humanity hasn't returned any Martian soil yet, but the universe itself was kind enough to do so.
so again, this is just (and pardon my crude language) some bitch crying she got a necklace with something that's even rarer than friggin diamonds (only 99 meteorites have ever been confirmed to be Martian) instead of that white iPhone she wanted to replace her black phone with.
OR she is actually in tears of emotional joy that her boyfriend did so much effort for her.
edit: the necklace is only about 40 £ according to their website.