This True Blood earring and necklace are from the same series designed by angs primary design school. With the same symbolic significance, the earring is morphology of blood.
It is not like the necklace whose pendant and chain are welded together and not replaced. This earring can be used in two ways. It can be worn as a wavering charm or as a pendant while it can show the simple and experienced as a stud. You can match it in each way with the necklace as you want.