The original store credit after 15% restocking fee is $397.75 (467.94-15%). The semi mount is also $467.94, so the pricec difference you need to pay is $70.19 (467.94-397.75).
Center Stone Information: Order #30793(2.03ct(8.15 - 8.18 X 5.00mm)
only semi-mount in 14k rose gold/size 4.5