Carvers and Collectors: The Lasting Allure of Ancient Gems
March 19-September 7, 2009
Getty Villa

The official webpage includes several nice photos (with descriptions) of assorted items from the exhibition and there’s a short little video demonstrating gem-carving techniques (I’ve always wondered about that). There are some audio commentaries which require you to have RealPlayer installed.
Reviews:
Getty Villa Showcases Intricately Carved Ancient Gems (Art Daily)