Behold, the "I Do" rings by Japanese artist and designer Sakurako Shimizu. Each set of bands is custom made, etched with a waveform of a couple's voices uttering any words they choose. (So long as it's pithy enough to fit on the band, we're assuming. "I do" seems a fitting choice, considering.)
To be honest, they're not really wedding rings. But! The interlocking rings are ridiculously small. These two circular rings of DNA, measuring only 18 nanometers in size, were made by a guy who got married while working on this experiment (thus the name).
Despite a lifelong fascination with the pinkie ring and a brief flirtation with a Livestrong bracelet, I've never actually worn jewelry. I might have to revise that stance, though, for this ring forged by Samurai swordmaking technique.