The diameter of the ring of a normal female ring is usually between 14-18. Different countries and regions have different ring size standards, so the exact size range may vary slightly.
In China, women's ring sizes are usually divided into sizes 4-24, with size 14 being the most common. In Europe, women's ring sizes are usually divided into sizes 40-75, with size 55 being the most common.
To ensure the comfort and fit of your ring, it's a good idea to measure your finger size before buying a ring. The circumference can be measured around the thickest part of the finger using a thin line or strip of paper, and then refer to the ring size chart to determine the appropriate size.
It is important to note that finger size is not a fixed value, it will be affected by a variety of factors, such as season, weight, age, etc. Therefore, it is best to try on several sizes when buying a ring to ensure that you choose the most suitable size.
In addition, ring sizes can vary slightly from brand to brand and style, so it's a good idea to know the specific size range of the brand and style before making a purchase.
In conclusion, the diameter of the ring of a normal women's ring varies depending on factors such as country and region, brand, and style, but it is usually between size 14-18. Before buying a ring, it's a good idea to measure your finger size to make sure you're choosing the right size and comfortable.