Subscribe to Knowledge Rocks Emails

Subscribe to GIA’s Knowledge Rocks — emails containing nuggets of wisdom about gems, jewelry and field gemology.

From pearls, which are born from irritations, to diamonds, which reach Earth’s surface after being shot out of volcanoes — each gem forms under tough and unique circumstances that make them the dazzling treasures that they are. Each week, we bring you the best of the best from our library, lab and field gemology team.

We hope our gem knowledge inspires you to rock on.