Opal flashes all colours of the visible spectrum. This will easily mesmerize any fortunate onlooker searching for the piece that will resonate with them.
The formation of Australian Opal is due to a large inland sea which stretched from south west Queensland through northern New South Wales and down into South Australia.
Australia was very close to Antarctica at this stage which made the water of the inland sea very cold. The water was also stagnant and took a long time to dry out as the continents started to shift. These conditions proved to be perfect for creating the world’s best Opal.
As the water started to dry out, it resulted in large scale and deep weathering of marine clay from the late cretaceous period. The weathering released silica which was sporadically deposited as Opal in suitable cracks, crevices, and cavities of fossils within the rock. This process of producing this beautiful Opal took many millions of years to perfect.
The play of colour that is produced from Opal is from microscopic silica spheres which form in a regularly stacked formation of similar size. These silica spheres create voids which allow light to enter and refract out displaying the spectral colours that you can see.
Opal is very subjective. Practically speaking, it makes little difference what is on the back of the stone or what the body tone of the stone is. It is about what YOU like and are drawn too. The colour and brightness of the Opal are still the most important factor.