Three Stone Antique Engagement Ring Cushion Cut DiamondsThree Stone Antique Engagement Ring Cushion Cut Diamonds. This antique engagement ring was made in the Victorian era and features a G. I. A. certified . 77 carat Old Mine Cushion cut (GIA# 5171231856). The accent diamonds on either side of the center stone are rose cut diamonds that weigh . 08 carat each. All three diamonds are set flush into the 14k yellow gold ring making it easy and comfortable to wear. This wedding ring has a dome shape and the