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 a rotating stock of name-brand jewelry from designers such as David Yurman, Judith Ripka, and John Hardy. Every piece is discounted at 40-60% off the retail price, and new items are added 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. A handcrafted John Hardy band ring ($177) comes adorned with silver dots while clusters of caviar beads embellish Lagos's beaded stud earrings ($105). A trio of canary, corundum, and peridot crystals predicts a future of compliments on Judith Ripka's sterling Ambrosia bracelet ($150), which itself compliments a pair of ottoman hoop earrings ($120).