Oval Diamond Halo Engagement Ring in Yellow GoldOval Diamond Halo Engagement Ring in Yellow Gold. This engagement ring is a hybrid of an old new and features a . 62 carat oval cut diamond at its center with . 16 carats of round diamonds surrounding it and set in 14 karat yellow gold. The accent stones surrounding the oval in the center are spaced out to create a bright, starburst look. The basket shows plenty of open space on the sides of the diamond to bring as much light into the stone as