Explore the stories behind the Smithsonian’s dazzling National Gem Collection during an online program — courtesy of Mentor Public Library — at 2 p.m. on Wednesday, Dec. 4.

The program will be led by Dr. Jeffrey Post, emeritus curator and author of The Smithsonian National Gem Collection Unearthed: Surprising Stories Behind the Jewels. He’ll share the scandals, mysteries, and human stories behind the world’s greatest gems, including the Hope Diamond, Star of Asia Sapphire, Carmen Lucia Ruby, Blue Heart Diamond and more.

Sign up to join the conversation here. A recording of the program will be available to watch afterward.