Sterling Silver Elegant White Lab Opal Oval Halo Necklace on a 16” chain. If you need a 18" please message me. Sterling Silver Snake Chain. Pendant Height: 12.5mm, Width: 10.7mm, Thickness: 0.8mm Bail Opening: 4.0mm Stone Material: White Lab Opal and Clear Cubic Zirconia Center Stone Size: 9.0mm x 7.0mm 925 Sterling Silver Rhodium Plated, High Polish Finish Chain: gauge: 20, width: 1mm Stamped .925 on back of pendant and clasp of chain