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Treated freshwater cultured pearls

Treated freshwater cultured pearls require a farmer to give nature a helping hand to form. Learn more about your pearly Pandora Jewellery and how to keep it in top condition.

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Handcrafted with integrity

Using only the highest quality freshwater cultured pearls, our skilled craftspeople transform these natural gems into innovative designs.

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Pandora’s treated freshwater cultured pearls are bleached or dyed

Once harvested, white freshwater cultured pearls are bleached, while coloured ones are dyed. Both types undergo a lustre-enhancing treatment

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Fragile beings

Treated freshwater cultured pearls are quite soft and prone to scratching and damage from acids, solvents, ultrasonic cleaning and dehydration. Some dyed pearls may fade or revert to their original colour when exposed to sunlight or strong light



The treated freshwater cultured pearls in our jewellery are cultivated by gently inserting pieces of donor mollusc tissue into a freshwater mussel. The tissue grows to form a pearl sac in which mother of pearl (nacre) is deposited layer upon layer until a pearl is formed. Once harvested, the cultured pearl is treated to enhance its colour, lustre and appearance. Like natural pearls, tissue-nucleated treated freshwater cultured pearls consist of nacre all the way through, as they contain no nucleus.

The look

Virtually all colours, often modified by additional colours called overtones, and with a pearly lustre. Some pearls also display the iridescent colour phenomenon known as 'orient'.


Treated freshwater cultured pearls have a hardness of only 2.5-4 on the Mohs scale. They also have variable levels of toughness influenced by ageing, dehydration and sometimes excessive bleaching during processing. This means that treated freshwater cultured pearls are prone to scratching and are relatively fragile. They are particularly susceptible to damage caused by acids, solvents and ultrasonic cleaning, and may also have a tendency to dehydrate over time under certain conditions. Some dyed pearls may fade or revert to their original colour when exposed to sunlight or strong light.

How to take care of your pearls?

Cosmetics should be applied before pearls are worn. Do not expose them to ultrasonic cleaning or high temperatures. Avoid exposing dyed freshwater cultured pearls to strong sunlight or display lighting for extended periods of time. Never soak treated freshwater cultured pearls in water or rub them harshly as this could damage the nacre. Instead, wipe them over with a very soft, clean cloth that has been dampened in lukewarm soapy water. Then pat dry. Your skin’s natural oils and moisture help prevent drying of pearls. So wearing pearls is one of the best ways to keep them looking their best.

Keep your Pandora perfect

Keep your Pandora collection as sparkly as you are! Discover how to clean your jewellery and give it the care it deserves.

Care set
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