price difference of 4369+4371 replacement ring

A) $1024 for this ring with a 5ct(9*11mm)DEF color emerald moissanite center, DEF color baguettes moissanite accents in 10k white gold. Size 7 .5( ONLY stamp 10K) Size 7.5

B)Clients have returned the original band of 4371+4369,we own client $603

C) The price difference of this replacement ring is $304