The hearts are created by an artist from Georgia named Red Sandlin, who forms the souvenirs from clay. Each rock is inscribed with a word or phrase, including "honor", "remember", "united in hope", and "reflect." One rock (of a larger size and higher price) is carved with the Virgil quote "No day shall erase you from the memory of time." Sandlin would not say how much she gets paid for her work.
These rocks, which are not actually rocks at all, and lack even a tenuous connection to September 11th or New York, offer a more anodyne, if equally pointless way for the Museum to raise revenue.