Opal- What do you need to know about this beautiful gemstone?
Opal jewelry has a beautiful play of colors and is known as the queen of gemstones. It has a hardness of 5.5-6.5 on the Mohs scale and is formed when silica-rich rainwater seeps down the rocks. After evaporation, these minerals along with minerals in the rock form opals. The black variety of opal is most desired as the colors displayed get highlighted against the black background.
