Jewelry designer Sandra Gronstra sorts sea glass outside her Swampscott studio.
By STACEY MARCUS
It seems like Sonja Grondstra was destined to be connected to the sea. The Swampscott jewelry designer collects pieces of sea glass from the nearby shores to create stunning handcrafted necklaces, bracelets, rings, pendants, earrings and pins that are featured in more than 60 boutiques throughout the country. Locally, you can find her work at Kats Boutique on Humphrey Street—just a few steps from where she finds her treasures, before transforming them in her Ingalls Terrace studio.