.18 Diamond Starburst Stacking Ring in 18k Rose Gold. 18 Diamond Starburst Stacking Ring in 18k Rose Gold. This chic stacking ring features . 18 carats of diamonds finished in 18 karat rose gold. Thirty nine (39) diamonds ranging from . 80 carats to 1. 25 carats are set in surface prongs at the head of the ring. Tapered in descending size, the diamonds are set at the head of the ring in a beautiful starburst form. The polished rose gold band is thin and easy to wear. This fashionable ring would make a