Genuine blue sapphire & diamond circle necklace. There are 4 marquise shape genuine blue sapphire that measure 4x2 mm in size, about 0.10 ct tw and 4 round diamonds that are about 0.03 ct tw, SI1-2 in clarity and G-H in color. This pendant hangs on an 18" inch chain. Available in white, yellow, and rose gold. Sapphire is the birthstone of September and the 45th wedding anniversary. This beautiful gemstone symbolizes loyal, royalty, wisdom, favor, truth, and protection.