Opals are formed from a solution of silicon dioxide and water. As water runs down through the earth, it picks up silica from sandstone, and this silica-rich solution deposits in cracks and voids, eventually solidifying into opal.
Black opal is the rarest and most valuable type of opal, prized for its dark body tone which provides a stunning backdrop for color play, enhancing vibrancy and visibility.
The value of an opal is determined by its color play, the brightness and pattern of the color, body tone, size, and transparency. Black opals are generally the most valuable.
Yes, some opals are treated to enhance their appearance, typically through dyeing or impregnation with oil, wax, or plastic, but these treatments can affect their value and durability.
When purchasing opal jewelry, look for vibrant play of color, a pleasing pattern, good brightness, and minimal inclusions or faults. The cut and setting should enhance the stone’s natural beauty without exposing it to potential damage.
