Shop › Two stone boulder opal ring Image 1 of 4 Image 2 of 4 Image 3 of 4 Image 4 of 4 Two stone boulder opal ring A$400.00 Stunning ring with two solid boulder opals, all in solid sterling silver. Size M (6).Ring is handmade by me, in Melbourne. Add To Cart Added! Stunning ring with two solid boulder opals, all in solid sterling silver. Size M (6).Ring is handmade by me, in Melbourne.