Australian black opals are the most valuable and expensive gemstone used in making jewellery. This stone is characterised by a dark body tone that ranges from dark grey to jet-black. The colour refers to the body tone of the stone, not related to a rainbow or spectral colours present in the opal. A completely black stone, with no shades of colour, are worthless.
Black opals have high traces of carbon and iron oxide, which causes the darkness of the stone. The dark shades of the stone highlight the rainbow colours giving the stones unique look making them precious as south sea pearls or more.
The vibrancy of colours makes the opal the most valuable form of all opals. At times, a black opal would have a natural layer left on the rear end of the stone that gives darkness to the stone and this highlighting the vibrant colours. The same principle applies for doublets and triplets who can e termed as an imitation of solid opals.
Black opals are generally cut into oval shapes. The natural shape of the stones decides the shape into which it has to be cut because the experts see to it that minimum work is performed on the stone before it is sold. At times, the black opal is cut into freeform or teardrop shape in order to maximize the size and carat of the stone.
Many artificial stones are being launched as solid and original stone. One should purchase the stones from an authorized dealer so that they can get a guarantee regarding the quality and purity of the stone.
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