Grey Spinel Engagement Ring w/ Diamond Accents in White GoldGrey Spinel Engagement Ring w Diamond Accents in White Gold. This modern engagement ring features a . 93 carat round cut grey spinel which is bead set in 14 karat white gold and adorned with . 20 carats of diamonds. The accent diamonds are all set on one side of the band surrounding the center stone and the settings imitate a sharp, almost marquise shape despite them actually being round diamonds. These design features all combine to create a unique