Blue Opal History, Meaning, Symbolism, Healing Properties & More One of the mesmerizing and captivating semi-precious gemstones that is known for its captivating patterns and strikingly beautiful blue hues is the Blue Opal gemstone. This gemstone belongs to the opal family, a family of gemstones that is famous for its iridescence and play of colors. The reason why blue opal jewelry is quite famous among jewelry designers, as well as jewelry enthusiasts, is because the blue opal stone set in the jewelry offers tranquil and soothing vibes.