Tie The Knot Ring - Gold Knot Ring - Bridesmaids Gift - 14k Gold Filled Knot Ring - Minimalist Gold Stacking Ring - Hypoallergenic Handcrafted * Hypoallergenic * Waterproof * Tarnish Resistant. This little ring makes a great promise ring or bridesmaid gift! 14k gold filled knot ring. Waterproof and made to last. 14k gold filled is great for sensitive skin and is tarnish resistant.