Great studs! I think I would just keep the old pair, since they look very similar to me (though the Blue Nile look just a smidge more sparkly).
If you want slightly more coverage, I would consider selling the old pair and compounding your funds to buy a larger pair of studs from Blue Nile, good color and excellent cut. If you don't really care about the size, just keep your old pair and enjoy! They're beautiful!