Hmm, yes durability issues can be involved when the diamond is that included but if you take good care of the bracelet and do not hit it against things it would be fine. If they have good brilliance they would still be gorgeous. I once had an I2 pendant, it was smaller too and honestly it was beautiful and I felt that if had personality. This is interesting but the inclusions make the stones more unique to a certain degree, yes with a loupe I could tell the stone was full of black dots but inclusions are different in nature too some are not carbon inclusions and are not black. Durability would depend a lot on how the stone is cut and what sort of inclusions, if the stone is cut well then it will still be durable. Since I studied at GIA I was aware of what SI2 means, however, the pendant was a good deal and I could not afford a better one. I see nothing wrong with it honestly and I would probably buy it if otherwise the diamonds and the necklace are nice. All jewelry has substantial markup so discounting them 50% is not that unusual. The bracelet may no have sold easily because at that price people might be inclined to get say a pendant that has better clarity but if you love tennis bracelets but otherwise could not afford them I do not see why you should pass.