People have worn jewellery throughout the ages for many reasons. Personal adornment, for decorative effect is the main reason, so you look and feel good. However there are many other reasons including wearing jewellery as a marker of social status (as in a wedding ring), as a symbol that means something personal such as love, luck or friendship (as in a friendship bracelet), and as an affiliation with a social circle or organisation. There were also functional uses of jewellery such as brooches and buckles.
The ritual of giving jewellery and the way it is worn is different in many cultures. If you are a Christian it is traditional to give a gift of silver when a child is christened. This tradition started in the Tudor times as silver was believed to a a valuable investment and symbolised independence when they were older. Whilst many cultures give a wedding ring as a sign of betrothal, the tradition is thought to be started by the Egyptians. The circle of a wedding band is a symbol of eternity with no beginning or end.
If you find the cultural value of jewellery interesting check out the infographic below.