Opal is what opal identification
Opal is one of the gold gems (Chrysoberyl) in mineralogy, belonging to the gold emerald mineral deposit. Opal has a variety of colors, such as honey yellow, brown yellow, wine yellow, brown yellow, yellow green, yellow brown, gray green, etc., in which honey yellow is the most expensive.
Gemstones that produce cat's eye effect in nature include tourmaline, greenstone, apatite, quartz, and kyanite, but they are not as valuable as gold-green cat eyes. Tourmaline cat's eye: the hardness is small, 7-7.5, density 3.06 g / cm3, refractive index 1.624-1.644. Quartz cat's eye: low hardness, 6.5 swing, low density, 2.78 g / cm3, low refractive index, 1.44. Artificial cat's eye: Opal made of artificial glass fiber, brownish yellow, blue and red. However, the artificial opal presents 2-3 bright bands together at the top of the curved shape, and the natural opal presents only one bright band.
Strictly speaking, "cat's eye" is not the title of a gem, but an optical representation of certain gemstones. That is, when the gemstones that are ground into a hemisphere are illuminated with strong light, the appearance will show a narrow and bright reflection, called "cat's eye light" or "cat's eye light", and then named according to what the gem is. If the gem is quartz, it is called "Quartz cat's eye", if it is a gold emerald, it is called "Golden Green Cat Eye." There may be many types of gemstones with cat's eye light. According to statistics, there may be as many as 30 kinds. In addition to quartz cat eyes and gold-green cat eyes, there are also "Gemstone Cat Eyes" and "Aquamarine Cat Eyes". Because the golden-green cat's eye is the most famous and most valuable, it is also referred to as "cat's eye" in the habit. Other cat eyes cannot be called this way. Generally speaking, opal refers to gold-green cat's eye gemstone, while other gemstones with cat's eye effect must be given the title of gemstone before the word "cat's eye", such as aquamarine cat's eye, tourmaline cat's eye and so on.
In Southeast Asia, opal is often considered a symbol of good luck. Everyone trusts it to protect the owner's health and longevity, to avoid poverty, to benefit the health of the reproductive system and related organs, to promote regenerative talents and blood circulation, and to rejuvenate beauty and beauty. Results. It can improve the skin's problems and prevent the wound from getting worse. Increase the creativity of people when thinking, avoid evil and become a protective stone that is not invaded by external forces. It also symbolizes courage and strength. It is often used as a talisman to avoid evil in the East. It also makes everyone brave enough to say goodbye to the past. Opal is often referred to as "noble gems". Together with the stone, it belongs to one of the world's five precious high-grade gems. British gem collector Hope has a well-known opal that has been carved into a shape that symbolizes the altar. There is a torch on top, all of which are spherical and about 1-1.5 inches in diameter. Opal is mainly produced in gas-forming hydrothermal deposits and pegmatite veins.
The value of opal is compared by factors such as color, orientation of the eyeliner, shape and weight of the gemstone. High-quality cat's eye gem, the cat's eyeliner should be thin and narrow, the boundary is clear; the eye should be closed and flexible, and the light should be bright; the cat's eye color should be in sharp contrast with the background; and the cat's eye line should be centered on the curved surface. When purchasing, you should distinguish the opal from other gemstone eyes and artificial cat eyes according to the judgment characteristics, and buy a veritable opal.
The main difference between cat quality and quality is:
1. Color: There are many colors of cat's eyes, mainly yellow with other colors, and the best color is honey yellow.
2, eyeliner: eyeliner demand is straight, even, continuous and continuous line, clear and not turbid, bright and not dark;
3. Component: For gems, the larger the component, the more geometrically multiplied the value. For the cat's eye, it is not an exception. There are few on the market, and the diameter is more than 5cm.
Here's how to tell the true and false of the opal:
1. The primary distinguishing 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 exceptionally significant, ie, it is also very clear under weaker sources. This is unmatched by other gems.
2. Use a single light source to illuminate from the side of the opal, the color of the sides of the opal is different. When the honey-colored opal is photographed from the left side, the left side is honey yellow, and the right side is milky white. When illuminated from the right side, the color is reversed.
3. Artificial opal is made of fiberglass, with red, blue and brownish yellow, and the brown-yellow species is somewhat like natural opal. The difference between the two is that the artificial opal presents 2-3 bright bands together at the top of the curved shape, while the natural opal is only one; the sides of the artificial opal are investigated with a magnifying glass, and the hexagonal honeycomb structure can be seen; together with the artificial cat's eye Stone has a lower hardness than natural opal.
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