Tiffany diamonds have been giving people heart eyes since 1848. Now the Tiffany & Co. store downtown offers a dazzling insider’s look at them at The Diamonds of Tiffany, on view through spring. It’s an experiential installation that invites you to examine Tiffany diamonds under gemological microscopes, watch videos exploring their provenance, and more. Admission is free. 730 N. Michigan; tiffany.com.