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Tips for verification black pearls
Author:珠宝城 Source: Publish time:2010-12-15

To verify a piece of jeweler is a natural black pearl or a dyed bean, the following tips could help you in making basic judgment by watching through your own eyes:

Color: The color of a black pearl varies from bright grey to black. The luster accompanying a dark basis makes a pearl beautiful. If you turn a black pearl slowly, you may see the continuing change of its luster, which likes a light rainbow. If you see two very black beans of same color, their color are consistent and even, you could be almost certain that they are dyed beans. The color of a dyed bean is sluggish and the color of drilling areas and impact areas are darker, which may be easily seen via magnifying glass with 10 times magnification.

Shape: A typical black pearl may be oblate, oval, pearl shape, or irregular shape. Normally black pearls of impact or ringed oval are very rarely seen and of fairly value. Therefore, if you see a super black one of smooth skin and very round, it is very possible that it is a dyed bean.

Size: Normally the diameter of a Chinese or Japanese salt-water pearl shall be no more than 9 millimeters. The minimum of the diameter of a black pearl shall be 8 to 9 millimeters. If a round black bean with 8 millimeters or less diameter, it is very possible that it is a dyed one.

Price: A round black pearl with 8 millimeters diameter shall be priced at RMB one thousand or above. A same size dyed one shall be RMB 1 hundred or 2 hundred. If you are very lucky to buy a black one with very reasonable price, please be reminded to ask the seller to take a note on your invoice indicating that the color of the pearl is natural.

If you are not convinced by the above verifying measures, you’d better bring the jeweler to a verifying institution for an accurate verification.

UV-light, fluorescence test. Under UV light, a black pearl normally shows fluorescence, and its color varies from bright red to coffee-colored red. Under UV light, a dyed one shows nothing or reflects light sluggish green fluorescence.

X ray test. An X ray photo distinguishes the dyed processed by silver salt. A bright white circle shows between the core of a bean and other parts of the bean, which proves the composition dyed.

X ray fluorescence test. The radiation of the wavelength of a pearl under X ray is fixed. To measure the length of a wavelength by spectrum tester, the existence of chemical elements and silver salt may be found. 

Infrared ray shoot test. A photo of pearl shall be taken by infrared ray film. The photo of a black shall show bight blue, while the photo of a dyed bean processed by silver salt shall show yellow or green-blue to yellow-green. 

The recommendation to people who like pearls is to go a pearl specialized shop in CP&J City in Zhuji, which is the largest market in China specialized in pearls. In all, it is still the old sayings that please go to a professional pearl dealer with good reputation, who are not only knowing but also honest, and distain to devalue their reputation for selling sham.
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