Literally: the Swiss watchmaker is bringing back a cult-favorite timepiece, which is made out of granite. The story starts in 1985 when Swiss watchmaker Tissot cut against the horological (and physical) grain by making a watch out of granite. However, much like the Chia Pet, the Rock Watch proved strangely popular. Powering the Rock Watch is a quartz movement, which helps keep the case depth fairly thin at 8.7 mm. Don’t dismiss the Rock Watch as a gimmick or passing fad, though.