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Conversion between the number of rings and the perimeter?
as follows

No.6: diameter 14 mm, circumference 45 mm.

No.7: diameter 14.5 mm, circumference 46 mm.

No.8: diameter 15. 1 mm, circumference 47.5mm

No.9: diameter 15.3 mm, circumference 48mm.

10: diameter 16. 1 mm, circumference 50.5mm

No. 1 1: diameter 16.6 mm, circumference 52 mm.

12: diameter 16.9 mm, circumference 53? millimetre

13: diameter 17 mm, circumference 53.5 mm.

14: diameter 17.7 mm, circumference 55.5 mm.

15: diameter 18 mm, circumference 56.5 mm.

16: diameter 18.2 mm, circumference 57 mm.

17: diameter 18.3 mm, circumference 57.5mm

18: diameter 18.5 mm, circumference 58 mm.

19: diameter 18.8 mm, circumference 59 mm.

No.20: diameter 19.4 mm, circumference 61mm.

No.2 1: diameter19.7mm, circumference 62mm.

No.22: 20.2 mm in diameter and 63.5 mm in circumference.

No.23: 20.4 mm in diameter and 64 mm in circumference.

No.24: diameter 2 1 mm, circumference 66 mm.

Pay attention to the size of the wedding ring

Ring refers to the standard of circle size, called hand inch, calculated by numbers. Hand-inch is divided into Hong Kong style and American style, and China mostly adopts Hong Kong style. Most people's hands are between 4 and 26 inches. The safest way to measure is to ask the clerk in the jewelry store to measure for both of you, or you can measure yourself by the method published on the Internet: find a rope or a piece of paper, wrap it around the place where your finger will wear a ring, mark the overlapping place on the rope or paper with a pen, then measure its length with a ruler and compare it with the hand-inch comparison table.