This is a fabulous 18k yellow gold ring with cobalt blue enamel and a band of 7 rose cut diamonds. The ring appears to have been designed around the band of diamonds which are set in 18k white gold and came from an older piece of jewelry. The ring is marked "750" (i.e. 18k gold) and "A.12". It is a size 8 1/2, is in excellent condition and weighs 7.9 grams.