FIBO STEEL4-8 Pairs Stainless Steel Stud Earrings for Men Women Square CZ Earrings,6-8MM

Are piercings needed for these earrings??

I never receive my earrings I purchased, even though it clearly said it was delivered, is there any way I can get my refund?

Does the sizing refer to the jewel size or length of earring?

Is the millimeter measured horizontally or diagonally?