The most striking aspect of the opal gemstone is its brilliance. It can be used to make all kinds of jewellery. Gemstone jewellery collectors value the beauty found in precious opal rings. Some gemstones compete with the opal in its variety of colors, and its ability to take on different colors, seemingly changing every moment. Opal is really a rainbow galaxy opal .Most opals come from Australia, and our planet Earth was formed millions of years ago in infancy. As the continents migrated and the waters flooded the land, this water contained silica that formed cracks in the sedimentary rocks. Over time, silica becomes like a gel and opal is formed at the bottom of the rock from the coating of this gel.