After tattoos and body piercing there is one more kind of piercing or you can say implant... that is tiny pieces of jewelry called 'JewelEye' in the mucous membrane of the eyes. However, it can be highly risky but I found it to be very cute.
The JewelEye device is 3.5 mm in diameter and offered in the following shapes: ring, heart, star. ring. The devices are packaged in a box with 10 sterile devices and the guidelines for use.
The cost of this implant in eye is expensive and will cost you some hundreds or thousands.
Apart from my likeness towards this implant I would personally feel like to suggest you not to do that to your eye it can cause loss of eyesight.