$887 for this R0139 ring with a 3ct(9mm) light blue round moissanite center, moissanite accents in 14K white gold and yellow gold.
You paid the loose stone in #21646, so the balance is $702 to have the finished whole ring.
https://www.doveggs-seattle.com/products/doveggs-round-art-deco-moissanite-engagement-ring-6?_pos=3&_sid=c90f9c58b&_ss=r&variant=44580819861750