O&G Australia genuine Opal Doublet (0.53cts) pendant set in 14K Yellow Gold (0.43gms). Opal is round shape, measuring 6mm. Pendant in total measures 9x17mm with bail. Bail fits up to 3mm. Opal has midnight blue, neon green and flashes of red, orange and yellow fire coloring. Opal, a precious gemstone, was called the Queen of Gems by the ancient Romans because it included the colors of all other gems. Opal is prized for its unqiue play of color, the ability to diffract light into flashes of rainbow color. Opal is the October birthstone.