Silver Ring with Turquoise Opal Stone

Beautiful silver ring with a turquoise opal stone and textured asymmetrical band. Approximately size 9.5 and in good condition. The opal has some minor damage as pictured. It was handmade in Costa Rica by Carla Arru Joyeria. I don't wear it often anymore so letting it go for someone else to enjoy! It's not marked sterling, but it does tarnish similar to my sterling pieces. I was told it is lab grown opal but don't have proof, so it's priced like costume jewelry.