A Multi-Colored Shell Necklace with an 18" adjustable length typically features a vibrant mix of natural or dyed seashells in a variety of hues. The shells may be smooth, polished, or textured, arranged in different shapes and sizes to create a colorful, beach-inspired look. The adjustable necklace length allows for a customizable fit, often extending up to 20 inches or more, and is usually secured with a simple clasp or knot. This type of necklace is lightweight and perfect for adding a playful, natural vibe to casual or summer outfits. The shells may range from pastel shades to bold, vivid colors, reflecting the beauty of nature.