Opal is a colourful gemstone that is sometimes referred to as the queen of gems. It is a pearl-like white gem with glossy lustre. Opal exhibits a charming interplay of vivid colours throughout its entire surface. It is an exceptional gemstone that produces stunning Birthstone Jewelry . During the month of October, opal is the birthstone. Opal, October Birthstone, looks stunning on display as an Opal Ring, Opal Bracelet, Opal Necklace, Opal Earrings or Opal Pendant.