How do you identify the opal? Let me first tell you what is the opal:
The cat's eye, the cat's eye, is called opal, which is an important variant of the gold emerald mineral family. The main feature of the opal is the clear-colored brown-yellow "eyeliner", the actual composition of which is a silk-like inclusion rutile tube, and a few are empty tubes. Because these tubular bodies are slender and dense, the "cat eye effect" is particularly noticeable, and is also very clear under weaker sources.
So, how do you identify the opal?
1. Use the light source to illuminate the opal from the side: When the yellow opal is photographed from the left side, the left side is honey yellow, and the right side is milky white; if it is illuminated from the right side, the color is just the opposite. Artificial gemstones generally cannot show such inconsistent changes.
The color of the real cat's eye is not brown or yellowish green. A very small amount of orange red reflection may appear under the incandescent lamp, but it is impossible to blend red and blue. The opal made of artificial glass fiber or semi-precious stones such as nephrite or kyanite, or rayon, contains many colors, except for the brownish yellow, blue, red and pure green, as long as you see these bells and whistles, I know that it is not a pure opal.
2. Under normal light: the surface of the natural opal has only one bright band at the top of the curved shape, while the artificial opal will appear 2-3 bright bands at the same time, and the brightness is not concentrated.
3. Observed with a magnifying glass: It can be seen that the artificial opal has a hexagonal honeycomb structure. This is because the current artificial gemstone forming technology needs to use hexagons to cast molecular molds, while the inside of the real opal is quite The floc structure of the layered sense is irregular.
Through the above introduction, we know what is the opal, and its identification method. I believe that everyone has a simple understanding through the introduction of this article.
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