
Ben Johnson of Seabourn Pearls
Buying pearls from an unknown source can be a tricky business. Of course you want to be sure you’re not buying fake pearls at real pearl prices. But you also want to be certain you’re not paying top dollar for low quality pearls.
This is the fifth in a series of articles to help you spot fake pearls. More important, this series will help you understand how pearls are valued and how dishonest producers and brokers dress up inferior pearls to fetch premium prices. Here in Part V we discuss dyeing and other color treatments for pearls.
To access the first four articles in the series click the links below.
Part I: The tooth test and other tools, tips and tricks for knowing if a pearl is real or fake.
Part II: The importance of luster and nacre thickness in determining high quality pearls that stand the test of time.
Part III: Understanding pearl value factors and how slight grading differences mean big differences in price.
Part IV: Pearl Processing, Artificial Enhancements and Deliberate Misrepresentation
Dye Jobs and Color Enhancements
Bleaching — For centuries white pearls from the Persian Gulf, Japan and elsewhere have been bleached. Back in the day bleaching meant laying the pearls on a carpet and setting them out in the sun. The pearls and carpet were then rotated at regular intervals over a period of weeks to develop a whiter, more even color on the pearls.

Japanese Akoya Pearls - 8X8.5MM - White with Rose Overtone. Bleached. Note the mirror luster. $2,500.
Bleaching is still common today in white or silver tone Akoya and freshwater pearls (I am not aware of any South Sea pearl producers that bleach their pearls). Now days, however, pearl whitening is done using chemical bleach rather than sun exposure. This treatment is common and not harmful unless the pearls being treated are low quality, short harvested specimens with thin nacre. Still, any bleaching treatment must be disclosed by the seller so inquire about it at the time of purchase.
Bleaching can result in pearls that are too white verging on opaqueness. To add vitality some producers “pink” their pearls by soaking them in a reddish dye that imparts a soft, rosy overtone. “Pinking” is relatively easy to detect by examining the drill holes under magnification. A pearl that has been pinked will most often have red spots inside the drill hole.
Dyed Pearls to Create New Colors — Certain producers and retailers now offer a wide variety of pearls in fashion and designer colors. Generally speaking, these suppliers buy up poor quality pearls that exhibit inferior color and luster. These are nearly valueless pearls that tend to be stained, spotted and blemished. The pearls are then dyed in any color you can imagine. I’m not a big fan of designer color pearls. To me dyed pearls lack all the nuance and allure of the genuine article and tend to look like Mardi Gras beads. But if you want pearls that are purple and green, turqoise and orange or red, white and blue then dyed pearls are for you. Just be sure you don’t pay much for them.

Dyed Pearls in Fashion Colors. You Be The Judge.
Remember, fine pearls need no enhancement. You can bet a cherry red or dark copper pearl has a face that requires a lot of make-up. Be aware of the marketing language that accompanies dyed pearls. When you hear things like “color enhanced” and “tint adjusted” know that you are being sold dyed pearls that aren’t highly prized.
Shady Monkey Business — There are several color enhancements out there that are deliberate attempts to rip you off. Caveat Emptor! Here they are:
Dyed Nucleus — Some producers have created “black” pearls by dyeing the shell bead nucleus a black color. This is typically done on Akoya oysters, which have a natural nacre color that is most often silvery to grayish blue. The resulting pearls are generally in the 8-9MM size range. The colors can be very convincing and the subterfuge very hard to detect.
Heating and Irradiation — Certain heating techniques have emerged that can impart a fine golden color on dull and otherwise low quality white South Sea pearls. Irradiation techniques have also arisen to transform stained, spotted and otherwise poor-color South Sea pearls into convincing imitations of Tahitian black pearls. Both techniques are difficult to detect so we recommend you make any major purchase of golden or black South Sea pearls contingent upon a corroborating lab report.
Silver Nitrate – Certain Chinese producers have been known to use silver nitrate solution on crummy, off-color pearls to create pearls that look like prized Tahitian pearls. Silver nitrate is highly damaging as it literally softens the nacre. Run screaming from any pearls that have been treated in this way.
If you like dyed pearls feel free to buy them. But don’t bust out your wallet and splurge. Dyed pearls are costume pieces and you should buy them on the cheap. Fine pearls are beautiful, natural things that need no enhancement.
If you have any questions about pearls please contact us at anytime. For a glimpse of our $5M inventory of the world’s finest natural color pearls please visit our gallery. Seabourn Pearls, the world’s finest.
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