As some of the most unique and special gemstones in the world, opals are known for their iridescent, fire-like appearance. If you look at opals from a historical context, you will find that throughout centuries, people considered that opals were made up of multiple gemstones and they were a single gem that was a cluster of different stones. We can assume that it was because of their iridescence and play of colors that opals had a rich history of folklore and holistic use. Talking about the types of opals, there of two types of opals, and their type is dependent on the color they take up during the formation process. The rich history of opal span across centuries. History suggests that in Ancient Rome, opals were considered a symbol of hope and love. Because opals have such a rich history, you will find them attributed to conflicting symbolisms and theories.