You are viewing a fine 18K yellow gold stacking style designed ring made in the 1980's. The ring measures 11 mm or just under 1/2" wide up the finger by 21 mm across. It is set with a natural untreated Colombian Emerald weighing around 3/4 of a carat. The ring is faintly marked: 750. It is a size 6 3/4 and can be re-sized. The ring weighs 6.6 grams.