About Marrin Costello

Learn About the brand

Marrin Costello is a modern luxury lifestyle brand rooted in timeless design, intentional craftsmanship, and empowered living. Founded by designer and entrepreneur Marrin Costello, the brand began as a childhood passion for jewelry-making and has since evolved into a globally recognized name in the world of demi-fine accessories. Each piece in the Marrin Costello collection is crafted with purpose—designed to be hypoallergenic, water-resistant, and non-tarnish—ensuring both beauty and durability for everyday wear. With a signature aesthetic that blends classic elegance with contemporary edge, Marrin Costello Jewelry seamlessly transitions from day to night, workout to gala. Beyond adornment, the brand is a celebration of self-expression, confidence, and conscious living. Marrin’s mission extends beyond design—she is a brand architect and businesswoman committed to building sustainable, authentic companies that empower others to thrive. Whether you're discovering your first piece or building a curated collection, Marrin Costello invites you to elevate your style with jewelry that tells your story.