Method for distinguishing dyed black pearls
How to distinguish dyed black pearls? The small series of China Jewelry Merchants Network has been arranged for everyone. It is difficult to distinguish the dyed pearls. It is not difficult to say that it is difficult. Master the following common sense, and with your eyesight, you should know that you are inseparable.
1. Color----Black pearls have different shades of light gray to black, and its beauty lies in the color of the look of the color, slowly turning the black pearl, you can see the slight rainbow-like flash is changing. No two pearls are exactly the same. If you see a bunch of (even a few) dark black uniform colors, the black pearls are very faint, you are almost sure that it is dyed beads. The color of the dyed beads is sluggish, and the black that accumulates in the holes and squats is deep. This is easily observed under a ten-fold magnifying glass.
2. Shape----Whether the black pearls you see are particularly round, the round black pearls are extremely rare and of high value. Typical black pearls are oblate, pear-shaped, oval, irregular, many With a shackle or loop, so the "value-for-money black pearl" you see is a skinny and very "round" beauty, it is very likely to be dyed.
3. Size----China or Japan usually has a seawater bead diameter of no more than nine millimeters, while black pearls have a diameter of at least eight to nine millimeters, so round black pearls smaller than eight millimeters are mostly dyed beads.
4. Price----Is the black pearl you see surprisingly cheap? An eight-mm round black pearl costs more than a thousand yuan, and the same size of dyed pearls only worth one or two hundred yuan. If you are fortunate enough to buy black pearls at a reasonable price, be sure to ask the merchant to indicate on the receipt that the color of the pearl is natural.
5. If you want to buy expensive black pearls, and the above identification method is still not safe, it is better to consider taking the jewelry identification unit to use the instrument as a definitive proof.
6. Ultraviolet light fluorescence test----Under ultraviolet light, black pearls often have fluorescence, and the color varies from bright red to coffee red, but the dyed pearls mostly do not respond to ultraviolet light, or exhibit a dull green fluorescence.
7.x light test----X-ray film can show the dyed pearl treated with silver salt. The pearly color of the dyed beads and the bead core show a light white color, which proves its dyeing composition.
8.x Photoluminescence Test----The pearl emits a specific wavelength of radiation under x-ray illumination. The degree of wavelength of the spectrometer can be used to detect the presence of chemical components and silver salts.
9. Infrared Photographic Test----Photographing pearls with infrared film. The image of black pearls is light blue, but the image of dyed pearls treated with silver salt is yellow, or greenish blue to yellowish green.
None of the above methods will damage the pearls. Similarly, we do not recommend destructive testing methods such as scraping powder or dilute acid wiping. Still the old saying, looking for a reputable professional pearl dealer, they know how to be honest and honest, do not bother to use fame to defraud your money.
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