Gilson Created Opal:

The laboratory opal producing process, was first invented by Pierre Gilson, Sr. of France in 1974. This process produces a kaleidoscope of colors. From the rare and precious black opal,
to crystal and white opaque opal.

The Gilson formula is considered the truest gemological process in the world today. Considered by many gemologists to by the world's finest laboratory grown Opal. This process takes from 14 to 18 months,and the colors are natural with no treatment or enhancements.

Unlike its natural counterpart, this created opal is much tougher and not prone to breaking.
It gets it's hardness because it contains no water. Unlike natural opal which does contain water. The lack of water in Gilson opal has currently brought about debates and differences of opinion. Concerning the final classification of Gilson Opal.

In any event. Natural Black Opal is exceedingly rare and expensive. With Created Black Opal cabochons, you can have all the sizes you need at an affordable price! The Gilson White opals are very nice too.

These stones whether they are finally classed as Imitation or Synthetic are the best mimic to real opal we have seen. They are grown in similar conditions as to what might be found in nature and do have all of the elements but water. We think their beauty, toughness and heat resistance is a plus.