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Antique Opal and Emerald and Seed Pearl Choker Necklace and Bracelet Late 19th Century Opals from Dubnik, Slovakia Prior to the discovery of opals in Australia the only known locality for opals in the world was a volcanic deposit situated in Dubnik, Slovakia. In fact, nowhere has opal been mined as long as it had been in this region. Sources dating back to pre-Roman times mention opals from this region. Pliny was quoted to have said "no other noble precious stone is as pleasing to the eye as opal".The mines in Dubn