The Set & Stones Penny Necklace, adorned with freshwater potato pearls, exudes timeless charm and beauty. The Set & Stones Penny Necklace, adorned with freshwater potato pearls, exudes timeless charm and beauty. Sarah Tullgren founded Set & Stones in 2016 when her love of jewelry was reignited by her grandmother's heirloom collection. From dainty designs to conversation-starters, Set & Stones uses high quality materials to create thoughtfully designed pieces that are meant to be worn and loved all day, every day.