Natural Ethiopian Fire Black Opal Silver Ring Xmas Gift Opal Ethiopian Ring Mens Top Quality Fire Black Opal Sterling Silver Mens Ring Fashion Gemstone Ring Fine Opal Ring. Total Carat of the Stone is 4 Carat. Total Weight of Silver is 20 grams. Unheated Untreated Natural Gemstone. Note: Stone Color as seen on the Store. We take the photos mostly in a Natural Daylight & Night Light condition and that combined with the screen you are viewing the item may vary a little in different lighting conditions and different lighting angles as all-natural stones exhibit different color variations.