KOSEKOMA 0217 - Lissajous Figure Ring (Size 8.5, 18.5 mm) #022: Circumference 58.3 mm / 2.29 inch. Hole diameter 18.5 mm / 0.698 inch. USA/Canada size 8.5. Japan size 17 Height 5 mm / 0.2 inch.
You can order another size of the ring
https://www.shapeways.com/shops/kosekoma?section=Math+Jewelry+-+Rings&s=0