It is widely known that opals were the engagement ring gemstone of choice in the 1800s and the iconic gemstone of the Art Nouveau period. Today, fine quality opal is highly sought after and because of its rarity, it is expected to increase in value. There is no other gemstone that is as unique or elusive. An exceptional phenomenon, the opal stone holds an unmatched play of colour. It’s the only gemstone that allows a lucky someone to hold their very own rainbow.