engagement ring semi mount : $693 for this ring without 2.228ct oval center stone, no bigger than 2.8mm round lab grown diamond accents in 10K white gold.(half eternity band) size 5.25. 

Center stone is 2.228ct oval lab grown diamond below: 

https://www.doveggs-seattle.com/products/doveggs-2-228ct-oval-f-color-vs1-clarity-excellent-cut-lab-diamond-stonecertified?_pos=1&_psq=2.228ct&_ss=e&_v=1.0

Enhancer:$889 for this XR0469 enhancer with no bigger than 2.8mm round lab grown diamond stones in 10K gold. 

So  

So the total price before 20% off is $3114