Opal is one of the spectacular gems that possess the main visual feature – play-of-color, which gives diversely colored reflections in accordance with the stone orientation. This is because of its internal framework which has small silica spheres that act as diffraction gratings to the light. The colour range is possible running from blue through green and red into yellow and even violet colouring making it one of the most colorful gems available.
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Types of Opals
1. Precious Opal: It has more beauty of play of color and is the most preferred one. The most popular types of precious opals are known as Black Opal with background black and strong colored body color, and White or Light Opal with light colored body.
2. Fire Opal: It may be present in orange, yellow or red interstice, and may or may not be capable of showing play of colour. It must be noted that while called fire opals they are not just treated opals, but rather admired on their own for the intensely red or pink color.
3. Common Opal: It is also referred to as “potch,” does not have the play-of-color and is often in pastel or matte, opaque tones.
Sources and Formation
Opals are mainly mined in Australia, and it is famous for its high-quality opals-Black Opal from Lightning Ridge. Others are from Ethiopia, Mexico, Brazil. Opals occur where waters contain silica and the silica accumulates and hardens to form opal over a thousand of sometimes million years.
Symbolism and Uses
Even from time immemorial opal has been associated with hope, inspiration and creative seam. Some people think it holds magical properties to resolve doubts and restore the state of mind. The gem is known as the birthstone for October therefore commonly used as gifts for people born in this month.
Care and Value
These kinds of opals are ranked about between 5.5 and 6 of the Mohs scale, which makes them delicate rocks due to their susceptibility to scratching or cracking.