This is the Big Blue Sterling Silver 1.0mm Omega Chain Features: 1.0mm 16 and 1.6mm 18" shown Solid .925 Sterling Silver Available in 16" and 18" Round .925 Sterling The latest trend in Sterling. Add this elegant Omega Chain necklace to complement any Sterling style. Keeps its form and It's so beautiful you can wear it with or without a pendant. Available in 16" and 18" Round .925 Sterling. 1.0mm 16" and 1.6mm 18" shown"