According to the query of Wedding Cat. com, Cartier's ring No.51is equivalent to the ring No.mainland 1 1, and its size is16.45 mm. The common size standards are as follows:

1, European standard: the size number of Europe is 44-7 1, and the diameter from small to large is14.01-22.61mm.

2. American standard: alias "American standard", and its number range is 4- 1 1. Among them, girls are 4-7.5 and boys are 7.2- 1 1.

3. Hong Kong standard: often called "port number", it is the standard used by domestic jewelers. The port number is 7-25, of which 7- 16 is for girls and 15-25 is for boys.

Cartier is a French watch and jewelry manufacturer, founded by Louis Fran in 1847. Ois Cartier was founded at No.31Montague Street in Paris. Now it is a subsidiary of Richemont Group in Switzerland. Cartier rings generally have three materials, gold, rose gold and platinum, and platinum is the most expensive. For example, the most popular love series among young people is also divided into a wide version and a narrow version, including a diamond version and a non-diamond version. Generally, when buying a suitable ring, women will choose the diamond-encrusted version, while men choose the diamond-free version, which is simple and elegant to wear and very beautiful.