Cat's eye is not the name of a gem
Opal is a gold emerald in mineralogy, transparent to translucent, glass to grease luster, dichroic, non-uniform plastid, hardness 8.5, shell-like fracture. But the most important thing is the following four points:
Cat eye effect
Opal is a gemstone with a "cat eye effect" and is a precious variety in gemstones. The so-called "cat eye effect" refers to the phenomenon that when a certain type is cut by a cutting method and appears like a cat's eyes under illumination, the variety is called the opal by the gems of the old man.
Honey color
The cat's eyes are of many colors, and even some cats are different (the eyes are different in color), but the cat with the honey-cat's eye is the most aristocratic. In fact, the same is true for the opal, the honey-colored opal is the most expensive, and it is also a color that will be specially marked on the GRS.
Single straight line through change
Pure natural opal only shows a bright band that hits the end, and the bright band changes although the light is strong. There are four main points in this sentence: single, hitting the bottom, straight line, change, and satisfying is the natural opal with high value.
Golden green cat's eye
Someone will show you a piece of gems and say that this is an opal. If you see that it does have a cat's eye effect, you will believe it. Then you have to pay attention! There are quite a lot of gems that can produce cat's eye effect in nature, and Xiaobian does not list them one by one.
Although there are many gemstones that produce cat's eye effect, only the golden-green cat's eye is the most precious, and only it can be called opal.
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