Use these stainless steel ear stud findings as a base with a glue such as E6000.
They measure 12x5mm. The depth is 12mm from the base to the end of the pin. The flat base is 5mm in diameter. The thickness of the pin (the part that goes through the earlobe) is 0.6mm thick.
E6000 can be found at most retail craft stores and hardware stores.
Stock up with this lot of 300 pieces.