A)You paid total $1161.63 in ##25633+#25754+#25961.So 10% off cancellation fee is $116.163.
B) For the engagement ring semi mount: $1059 for this XR1853 ring semi mount without #26322 center, with 2.2mm lab grown diamond accents in 18K rose gold & 10K white gold. Size 6.5
C) Wedding band: $724 for this wedding band with 2.2mm round lab grown diamond stones in 18K rose gold and 10K white gold. 
So the price difference with 17% off is $550.586 ($1059*0.83+$724*0.83+$116.163-$1045.467)