Alexandrite is the birthstone for June and the gemstone to give for your 55th wedding anniversary.  These stud earrings are made with lab created color-changing alexandrites that are 4mm in diameter and set in 4-prong sterling silver stud earrings. They aren't quite purple, and not quite blue...somewhere in between depending on the light source!  I've sold a bunch of these cute little studs at my art fair booth...they are simple and make a great, easy gift.