This is very interesting!
Why should the wedding ring be worn on the fourth finger?
There is a beautiful and convincing explanation given
によって the Chinese.....

Thumb represents your Parents
秒 (Index) finger represents your Siblings
Middle finger represents your-Self
Fourth (Ring) finger represents your Life Partner
& the Last (Little) finger represents your children

Firstly, open your palms (face to face), bend the middle fingers
and hold them together - back to back
Secondly, open and hold the remaining three fingers and the


Now, try to separate your thumbs (representing the parents),
without any other fingers opening/separating..., they will open,
because your parents are not destined to live with あなた lifelong,
and have to leave あなた sooner または later.

Please 登録する your thumbs as before and separate your Index fingers
(representing siblings)...., they will also open, because your brothers
and sisters will have their own families and will have to lead their own
separate lives.


Now 登録する the Index fingers and separate your Little fingers
(representing your children)...., they will open too, because the children
also will get married and settle down on their own some day.

Finally, 登録する your Little fingers, and try to separate your Ring fingers
(representing your spouse). あなた will be surprised to see that あなた just
CANNOT......, because Husband & Wife have to remain together all
their lives - through thick and thin!!