September's birthstone takes center stage in this elegant earring pair. Round-cut sapphires (2 ct. t.w.) rest beautifully in an 18k gold over sterling silver setting for resplendent sparkle. Approximate diameter: 1/4 inch. Almost all gemstones and blue and black diamonds have been treated to enhance their beauty and require special care. All gemstone carat weights (ct. t.w.), if mentioned, are approximate; variance may be .05 carat.