What has attracted people to opals over the centuries? Color, color and more color! Opals change color when viewed from different angles and angles. Sometimes it is a little too light and you shake your head and suddenly an amazing explosion of glowing color glows on the stone. Very few natural gemstones do that.
Unless you are lucky enough to pay more the quality improves. But you can still get high-gloss colors at low prices if you buy double or triple. These are pieces of opal reinforced with strong support of colorless opal. The triplet has a clear dome of quartz or other material on the surface.
Opal ring starts as a silica gel that penetrates into the sedimentary strata and gradually hardens over millions of years and the natural process. As an opal miner I have seen opal in this early stage where it is soft. Opals contain a high water content of between 3 and 10 percent. Moh's hardness level is around 5.5 to 6.5 and that is soft.
Australian opals are divided into several groups:
Black opal from the Lightning Ridge area of NSW.
White opals and light opals come from the Coober Pedy region in South Australia. These species also occur in pristine areas such as Mintabie and Andamooka.
Boulder opals from Queensland.
Then there are other small areas that produce small amounts of high quality opal.
Black opal with a black base and white opal with a white base while Boulder has more opal or through an ironstone base.
Then find the different levels of darkness you can say. So you might find an opal from Lightning Ridge or Coober Pedy with a gray base. That means the stone has a bright red or blue glow or other colors mixed within the base gray. This gray base can be light gray or almost black. When it reaches a very dark color we often call it black opal. It's like the marbles of the kids you see.
Then we get Crystal opal. Crystal is clear but colors can jump at you from this clear, see basic. We also have different levels of crystal opal. If we can clearly see through the crystal we will be distinguishing it as a semi crystal.
How much does it cost? It is very difficult to say what opal is worth. We can measure and measure but that does not help until we are able to determine the quality. We look for the best pattern in opal, bright color and very bright color. Red is often the most expensive color. However, a small, strong green stone will have more control than a dark, dark red stone. Since all opal is very different from the following it is a personal opinion.
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