Shop › Opal Ring Image 1 of 4 Image 2 of 4 Image 3 of 4 Image 4 of 4 Opal Ring A$350.00 Boulder opal ring.Sterling silver.Size O (US 7 ¼)Handmade by me, in Melbourne. Add To Cart Added! Boulder opal ring.Sterling silver.Size O (US 7 ¼)Handmade by me, in Melbourne.