I expected these studs to be just a little bit larger.  They are quite small.  Now that I am a senior, I tend to wear mostly studs as I have short hair and I like that look better.  I have many pairs of 14K yellow and white gold hoops, large and small, but I am in to studs now and have wanted a pair of green stones.  These were just too small.  I believe they are 6mm and I would prefer at least a 7 or 8mm.  Otherwise, they would have been OK for me.