2.09 Three Stone Diamond Engagement Ring in 18k Yellow White Gold.  This sparkling three stone engagement ring features 2.93 carats of diamonds finished in 18 karat white and 18 karat yellow gold. The GIA-certified center stone is a 2.09 carat Round Brilliant cut diamond. Near colorless and highly brilliant, the center diamond is prong set in 18k white gold. Two (2) .42 carat accent diamonds flank the center stone. From the profile, a modern cathedral mounting holds the diamonds and is finished on a polished 18 karat yellow gold band.