June Birthstone Claddagh Ring - Claddagh Birthstone Jewelry - Rings from Ireland. Alexandrite: Wisdom First mined in Russia in the nineteenth century and named after a czar, alexandrite is among the youngest of the birthstones. Just after diamonds and rubies, this gem is also the hardest of the minerals. It traditionally grants its wearer a clear mind and good luck. It also comes with the promise of both joy and courage.