Shop All Silver › Adjustable Opal Ring Image 1 of 3 Image 2 of 3 Image 3 of 3 Adjustable Opal Ring $45.00 A beautiful open-ended sterling silver ring with two opal gemstones. This ring is easily adjustable with a smooth 4mm band. Purchase Added! A beautiful open-ended sterling silver ring with two opal gemstones. This ring is easily adjustable with a smooth 4mm band.