Passage Ring

See in augmented reality:
Passage Ring AR link!

The ring should fit you comfortably; it should be tight enough not to fall off but loose enough to slide over your knuckle.

Measure the circumference of the finger where you are going to put the ring with a sewing meter, if you do not have a sewing meter you can cut a strip of paper, surround the finger with the strip and make a mark.

Then measure that section of the paper with a ruler or tape measure, the measurement you get is the circumference.

Measure the finger a couple of times to avoid mistakes.

circumference: XS(50mm), S(54.3mm), M(58mm), L(61.8mm), XL(66mm)

See more detail:
Size Guide 

Every order comes with a Carpediem's architecture model case. 

Japan: Yamato Transport, ¥1,000. Arrives 1–3 days after dispatch.
International: EMS with tracking, worldwide. The rate for your country is shown at checkout (about ¥3,500 / US$22 to the US). Arrives 5–12 business days after dispatch. Import duties and taxes are paid by the buyer.
Orders are dispatched within 1–3 business days. Free shipping on 2+ items.

Returns: 30 days from delivery on all items, unworn and in the original packaging. Email carpediemsculpture@gmail.com to start a return.