The difference between the artificial and natural opal is actually very big. Let's take a look at the identification method of the opal bracelet.
The identification of cat's eye gemstones is mainly from the aspects of refractive index, density, hardness, inclusions and other characteristics. Most cat's eye gemstones are gray-brown and translucent, and the opal stones with similar refractive indices are also more. The cat's eye gemstones are all cut into a curved surface. The refractive index itself is only an approximation. If the gemstone is inlaid, its density cannot be directly measured, which makes it difficult to accurately distinguish different cat eye gemstones.
Opal is one of the important variants of the gold emerald mineral family. The hardness is 8.5 degrees, second only to diamonds and red and sapphire. Its color is mostly yellow, yellow brown, yellow green, green white, coffee and other colors. It is obviously golden with color, and its Chinese name is also obtained. A good opal, the bright line of the cat's eye is located in the center of the gemstone face, narrow and clear, and the light is visible. Opal is very precious due to its special light effect, and high-quality opal above 10 carats can be worth millions of dollars.
The method for identifying the opal bracelet is as follows:
1. The main recognition feature of opal is the clear brown-eyed cat's eye. The filamentous inclusions of the opal are rutile, and some are empty tubes. Because these tubular bodies are slender and dense, the cat's eye effect is particularly noticeable, and is also very clear under weaker sources. This is unmatched by other gems.
2. Artificial opal is made of glass fiber, red, blue and brown, and the brown-yellow variety is somewhat like natural opal. The difference between the two is that the artificial opal has 2-3 bright bands at the top of the curved shape, and only one natural opal; the sides of the artificial opal are observed with a magnifying glass, and the hexagonal honeycomb structure can be seen; Stone has a lower hardness than natural opal.
3. Use a single light source to illuminate from the side of the opal, the color of the sides of the opal is different. When you look at the yellow opal from the left side, the left side is honey yellow, the right side is milky white, and when it is illuminated from the right side, its color is just the opposite.
Nylon Fabric,Cotton Blend Fabric,Blended Chiffon Fabric,Blended Fabric
SHAOXING CITY TIANHONG TRADE CO., LTD , https://www.sxtianhongfabric.com