It is not too late to replace lab grown diamond stone accents. Please confirm it is size 5.25, 10K unplated white gold. So the price difference is $106.6($438.7-$332.1).
$535 for this ring semi mount without #29091 center, with trillion moissanite,1.5*3m marquise lab grown diamond and round lab grown diamond accents in 10K white gold. Size 5.5 (2.1mm band width,1.6mm band thickness) After 18% off, the price is $438.7.