sounds like you've got a 'mindclean' issue. when you have a mindclean issue, it's not unusual to mistake a prong reflection for an inclusion lol. But of course SI2 as a grade can vary tremendously so it can be worth getting to know your stone, so you don't jump at every imagined black dot.
SI2 is graded looking through a 10x loupe, it's not graded with the human eye.
Many SI2 diamonds show no inclusion to the human eye, when viewed from the top.
I have two SI2 diamonds - not specifically through choice, but because I fell in love with these diamonds and were of the size and cut quality available to me in-house at the time I wanted to buy. They are both eyeclean, they are both beautiful, and neither have EVER embarrassed me in public.
With one of them, if you put the diamond up and look directly through the side of the diamond, you can see the (colourless) grademaking inclusion.
The other SI2 diamond you must hold before you, forward and back, at a particular unusual angle with the light coming throught the diamond, and turn slowly, before the twinning wisp inclusion shows. It takes quite a degree of patience, some minutes sometimes, before the inclusion becomes visible with the naked eye.
Obviously these inclusions are NOT visible to even quite the stickybeak observer when I am wearing the ring!
I don't think anyone looking at my stones could ever fairly claim my diamonds were not good quality diamonds. And tbh, their opinion doesn't matter to me anyway. I wear it, I love it, and I get to enjoy it each and every day... so only I matter.