Ring 18 corresponds to the mainland version, with a circumference of 58mm, that is, 5.8cm；; The diameter is 18.5mm, that is, 1.85 cm. The circumference of the Hong Kong version is 60mm, which is 6.0cm；; The diameter is 18.2 mm, that is, 1.82 cm.

In fact, there are two kinds of ring size comparison tables in China, one is the mainland version, and the other is the Hong Kong version, so before buying a ring, you have to decide which version to use as the basis.

According to the Hong Kong version of the ring size comparison table, the ring numbered 18 has a circumference of 60 mm, and then a diameter of18.2mm. In addition, the Hong Kong version of the ring size comparison table ranges from No.7 to No.25..

According to the mainland version of the ring size comparison table, the circumference of 18 ring should be 58 mm, and then it is directly measured as18.5 mm. In addition, the mainland version of the ring size comparison table ranges from No.4 to No.26.

Method of measuring ring size:

The safest way to measure the size of the ring is to ask the clerk in the jewelry store to measure it for both of you, and it is best to buy it together, because the wedding ring requires a higher hand type and hand type, and only when I wear it can I see the effect and choose the one that suits me best.

You can also test it yourself by publishing it online. It's best for two people to go shopping together, because the wedding ring requires a higher hand type and size. Only when I put it on can I see the effect and choose the one that suits me best.

Find a string or a piece of paper, wrap it around the finger where you want to wear the ring, mark the overlapping part of the string or paper with a pen, then measure its length with a ruler and compare it with the hand-inch comparison table.