Jewelry can have an expression or meaning to the wearer that is unique to the individual.
The KEY can symbolize the KEY to one's heart, the KEY of ife, hard work is the KEY of success and so on. As well, a KEY can represent newe beginning as you open the door to new opportunities.
Two of my favorite expressions include :
"A soul-mate is someone who has locks that fit our keys and keys to fit our locks" ~ Richard Bach
"Three keys to more abundant living: caring about others, daring for others, sharing with others" ~ William Arthur Ward
Do you remember when you were a child, and you hung your house keys around your neck with a piece of string? I certainly do, and I can tell you that my keys never looked as pretty as the ones above.