Opal is one of the most beautiful and precious gemstones in world, predominantly found in Australia. Opal is related to its more commonly found but highly crystalline cousins quartz and agate, It is one of the precious gemstones found on planet earth, sharing with rubies, sapphires, emeralds, and pearls.

Opal jewelry is the most colorful gems. Its splendid play of color is unsurpassed, and fine can be more valuable than diamond. There are also many variety names given to the numerous forms of both precious opal and common opal. See the opal variety for an extensive listing of all opal varieties.

The most desired and beautiful of opal is black opal, which is a dark blue, dark green, or black background with a strong play of color. Next in importance is white opal, which is a light colored body color. with strong play of color. Opal, often used in jewelry, are thin slices of precious opal glued onto a matrix material. Such gems are considerably cheaper than solid opals, yet provide the same play of color.

The value of each opal differs greatly depending on the unique qualities of the opal. There are many determining factors, including the tone body, colour, size, pattern, and brilliance.