Charlotte Kimber / Carrie Haase / Noritamy
My math teacher for grades 8 and 9 (maybe the best I ever had) had his class in room 314. In honour of him and Pi Day (3.14), here's a cluster of circles from UK jeweller Charlotte Kimber's "Tentacles" series.
Above, more circles from Chicago's Carrie Haase.
Even more jewellery: