Semi mount: $657 for this ring semi mount without NP325120144 cushion lab grown diamond center , with lab grown diamond accents in 14k rose gold. Size 7 ( To keep the same color between lab grown diamond and accents, we quote with lab grown diamond accents. )
Stone: $1299 for this 2.38ct(8.79*7.43*4.81mm), cushion, D color lab grown diamond stone.
So with 20% off and 10% cancellation fee, the price difference you need to pay is $791.696 (1956*0.8+$96.638-$869.742 ).