My daughter generally designs jewelry for Pi Day. In 2026 she got done a little early, on March 6, which is eight days ahead of the 14th. Usually we're finishing up on the 13th.
This year's piece is a ring: ribbed, darkened bands with a pi symbol cut out across the front. The ribs are actually a mistake. Something to do with me setting up the rotary chuck on the laser wrong. But I liked the way it came out.
An earlier year's effort is on the Pi Day Earrings page.