This is very interesting!
Why should the wedding ring be worn on the fourth finger?
There is a beautiful and convincing explanation given
由 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 你 lifelong,
and have to leave 你 sooner 或者 later.

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