It is $781 for this ring semi mount without lab diamond center, with 2 pieces 2*3mm baguette lab grown diamond accents and round lab grown diamond accents in 10k white gold.
For your old ring returned for replacement, the restocking fee is 30%. Therefore, after returning the credit, you will have $556.30. The price difference for the new semi-mount fits for #28704 2.549ct lab diamond is $224.7
NAGL apprisal for lab diamond price is $50