Bella Cosa Jewelers 18K Two Tone White and Yellow Gold Emerald 1.43 Carats and Diamond 0.67 Carats F-G and VS1-VS2 Ring A stunning ring in 18K white and yellow gold. Set in the center is a genuine, Colombian emerald and has minor oiling which makes this emerald very rare. The two emerald cut diamonds only add to this impressive ring. The ring band width measures 0.07 inches.