Beautiful hand set blue sapphire stud earrings, 4mm in size. Sterling silver settings with 5mm medium weight ear nuts. Gorgeous deep blue sapphire gemstones, these are the birthstone for September. Perfect for everyday wear... note: these are lab created gemstones. lab created gemstones are chemically identical to their natural counterparts, without any of the inclusions or flaws... these are flawless, timeless, and beautiful... enjoy !