So you could have gotten either a larger stone at 1.27 or a 1.02 for $4,403.25, and that's considering it's OVER 1 ct mark which always drives the price up from a .98. A platinum setting should be no more than $550-$800, depending on if it's premade or customized, and simple...That does not justify the almost $3600 makr up.
Check the net, or better yet, do that and look through the PriceScope vendors (who have TOP Notch cuts), and see if you can either return the ring, or if you realy like it, get a price adjustment. I believe if they are so off on price, they should be understanding and at least bump up your color, or give you back some money....or they could be awful and try to be difficult. That's when you let them know you are on a diamond forum with many potential customers, and could possibly make them lose some...