The Allison sea glass necklace showcases a single shard of cobalt sea glass, nestled in a curve or wave design of sterling silver. The sterling silver cable chain is attached permanently to each side of the design. Please specify when you order if you would would like a different sized chain. It comes standard with an 18 inch chain attached. We also offer this design in 16 and 20 inch lengths. Just leave a note with your order if you would prefer a different length.