The size of the ring is usually called the hand inch, and the hand inch is divided into different rings according to the diameter and circumference of the inner ring of the ring, which is convenient for production and wearing. Hand inch is a technical term in the jewelry industry, which refers to the size of a ring. Based on the diameter and circumference of the inner ring, it is divided into different turns, which is convenient for production and wearing.
Hand inches are expressed in millimeters and numbers. According to the international standard ISO 8653: 1986 (China district), the minimum hand size is 39. 1mm, and the diameter is 12.5mm, which is set to NO. 1; The maximum hand inch has a circumference of 69.7mm and a diameter of 22.2mm, and is set to No.27, with 27 numbers.
Among them, 1 to 5 belongs to children's hand inches, and adults' hand inches are between 6 and 27. 12 is the most common adult female. 18 is the most common adult male. These two numbers are followed by the number 3, which is the most common number of hands.
The number of hands is divided according to the circumference and diameter of the inner ring, and the conversion formula of circumference and diameter is: D=C/π.
Where: d is the diameter of the circle, mm;
C-circumference, mm;
π-π。
Extended data:
Measurement method of ring size
1, perimeter measurement method
Wrap a slender paper or silk thread around the finger to wear the ring, mark the intersection point, and then measure the length from the starting point of the paper to the mark with a ruler, that is, the finger circumference. According to the measured finger circumference, you can find the ring size that suits you.
Step 2 refer to the old ring
If you just don't know the exact size, but you already have a ring of the right size, you might as well use the old ring directly. Put an old circle of suitable size on the paper, draw a line along the inner circle, and measure according to the inner circle line until you reach the toilet.
3, jewelry store authoritative measurement
If time permits, you can go to a jewelry store and try on different ring sizes in the jewelry store to find the ring size that suits you best. However, if you try it on in winter, your fingers will be thinner than in summer because of the cold weather. So if you try it on in the afternoon or evening, the measured size can be more accurate.
Baidu Encyclopedia-Shoucun
People's network-teach you to choose the right size ring by hand.