A sea glass necklace pendant is a piece of jewelry crafted from sea glass, which is glass that has been naturally weathered and polished by the ocean over time. These pendants often feature a smooth, frosted appearance due to the abrasion from sand and waves. They come in various colors, shapes, and sizes, making each pendant unique. Commonly, they're set in metal frames or wire wraps to create a wearable piece of art inspired by the beauty of the sea.