Jewelry can make an outfit sparkle, though only exposure to dangerous amounts of radiation can make it truly glow. Stay safe while looking sharp with today's Groupon: for $40, you get $100 worth of designer jewelry from SweepStreet.

The bauble buffs at SweepStreet stock their virtual shelves with discounted name-brand jewelry from designers such as Lagos and Judith Ripka, adding new pieces to the mix every day. From Adami & Martucci, a rhodium-plated sterling-silver ring ($90) wraps one lucky finger in an intricate design as the silver o-shaped pendant ($92.50) dangles demurely from necks. Clusters of caviar beads embellish Lagos's beaded stud earrings ($105), and a trio of canary, corundum, and peridot crystals predict a future of compliments on Judith Ripka's sterling Ambrosia bracelet ($150). Because insurance is included in the shipping price for all items, buyers can wait by their mailboxes with confident anticipation.