the price difference that you will need to pay is $576.16(setting)+$1043.56(stone)-$1746(replacement lab diamond) $126.28.
https://www.doveggs-seattle.com/products/doveggs-3-005ct-cushion-d-color-vs1-clarity-excellent-cut-lab-diamond-stonecertified https://www.doveggs-seattle.com/products/doveggs-3-005ct-cushion-d-color-vs1-clarity-excellent-cut-lab-diamond-stonecertified