Rare Brown Star Agate Cabachon Man's 14K Gold Ring Size 13-1/2. The agate is set in a custom made 14K gold setting. The agate measures 15 millimeters long by 12-1/2 millimeters wide. Approximate carat weight 8 carats. This is a rare and beautiful ring. It weighs 16.7 grams. There is a hairline in the agate that you can see if you put a flashlight under it . You cannot see it when you wear this ring.When you place a light under the stone it changes color to green.