Cover Among all cultured pearls, South Sea pearls are the largest, valued for their impressive size
Among all cultured pearls, South Sea pearls are the largest, valued for their impressive size
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Forget the romantic myth of the irritated oyster; CPAA Certified Pearl Specialist Wong Chee Sheun explains the biological accidents that create natural pearls and the professional standards used to define their true worth
You might have heard the story that pearls are formed to soothe irritation caused by a grain of sand, and that the by-product of this discomfort is something beautiful. Romantic, isn’t it? In reality, this idea is a century-old myth that has been passed down so often that it has become a widely accepted fact. Let’s set the record straight.
Before we talk about pearls, think of the luminous, iridescent layer lining the inside of an oyster shell. This is the mother-of-pearl layer, made of nacre, secreted by the oyster’s mantle. Think of the mantle as a master artisan whose role is to secrete the nacre that forms the shell’s inner beauty. Hint: the colour of the mother-of-pearl often matches the pearl that the oyster produces — because both are made from the same nacre.
Also read: How pearls can help foster virtues of purity, integrity and honety
Above A white Akoya pearl
A white Akoya pearl
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Natural pearls are not formed to soothe irritation, but as a result of injury. When a small animal or foreign body enters the oyster, it can damage the mantle. Tiny fragments of mantle tissue are displaced and begin coating the intruder, initiating the formation of a pearl. Imagine these displaced mantle tissues as artisans relocated to a new studio. They continue their craft, secreting nacre layer by layer around the intruder. Over time, the layers accumulate, slowly creating a lustrous natural pearl.
So the idea that a grain of sand slips into the oyster that causes it to “soothe” the irritation is unfounded. Sand cannot injure the mantle, and gemmological studies of hundreds of thousands of natural pearls have never found one with a grain of sand at its centre. Pearls are not formed as an act of defence, but as a remarkable accident of biology.
When choosing pearl jewellery, there are a few key qualities that distinguish an exceptional pearl from an ordinary one. While beauty is always personal, understanding these factors allows shoppers to appreciate why certain pearls are more prized than others. Lustre is the defining quality that sets pearls apart from all other gemstones. It refers to the intensity and sharpness of light reflected from a pearl’s surface.
Above A pair of Tahitian pearl earrings with exceptional lustre, reflecting the surrounding environment with remarkable clarity
A pair of Tahitian pearl earrings with exceptional lustre, reflecting the surrounding environment with remarkable clarity
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An intuitive way to assess lustre is to observe reflections. Pearls of exceptional quality reflect light brightly and sharply—sometimes clearly enough to see your own image on the surface. Pearls with poor lustre, by contrast, appear chalky or dull, absorbing light rather than reflecting it. When other factors are equal, higher lustre almost always translates to higher value.
Different pearl types express lustre in distinct ways. South Sea pearls glow with a softer, satiny radiance, while Tahitian pearls often display striking, metallic reflections. Akoya pearls are known for their crisp, mirror-like sheen.
A pearl’s surface quality refers to how clean or blemish-free it appears. Pearls with smooth, clean surfaces—or only minute characteristics that are difficult to detect—are generally more valuable.
Surface features such as small indentations, scratches, or natural marks are common, as pearls are organic gems. However, when these characteristics become numerous or visually prominent, they can affect both appearance and value. In fine pearl jewellery, it is the absence of obvious surface imperfections that often sets higher-quality pieces apart.
Within the same pearl type, larger pearls are rarer and therefore more valuable. However, size should always be considered within context.
Different pearl varieties have different natural size ranges. Akoya pearls, for instance, are naturally smaller than South Sea pearls, yet an unusually large Akoya can be rarer—and more valuable—than a South Sea pearl of the same size. Meaningful comparisons are always made within the same pearl category.
Above A Tahitian pearl with a greenish gray bodycolour and subtle pink overtones, displaying the highly sought-after peacock hue
A Tahitian pearl with a greenish gray bodycolour and subtle pink overtones, displaying the highly sought-after peacock hue
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Pearls occur naturally in a wide range of colours beyond the traditional white or cream. Within each pearl type, value is shaped by a combination of beauty, rarity, and consumer preference.
For example, highly prized Akoya pearls are typically white or silver-toned, while Tahitian pearls are sought after for their vibrant hues, such as peacock or aubergine. South Sea pearls are valued for their silver and golden shades, and freshwater pearls are admired for their natural whites and soft purples.
It is worth noting that some pearls on the market have been dyed or colour-treated to imitate more valuable varieties. Natural colours are generally more desirable and valuable than artificially enhanced ones. Visible colour concentration around a drill hole can be an indicator that a pearl has been dyed.
Above A pair of Akoya pearl earrings, carefully matched for size, shape, colour, and lustre
A pair of Akoya pearl earrings, carefully matched for size, shape, colour, and lustre
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Perfectly round pearls are the rarest and traditionally command the highest prices due to their scarcity. However, shape is also an expression of character and personal taste.
Many modern collectors and designers are drawn to baroque and non-round pearls for their organic forms and individuality. While roundness may influence value from a rarity perspective, beauty ultimately lies in how a pearl resonates with its wearer.
Matching becomes particularly important when pearls are used in pairs or strands, such as earrings or necklaces. Well-matched pearls share a harmonious balance of size, colour, lustre, and shape.
Achieving excellent matching is time-consuming and often takes years, especially for strands composed of natural pearls. This level of consistency is rare, which is why finely matched pearl jewellery holds enduring value and lasting appeal.
Trained as a GIA Applied Jewelry Professional and CPAA Certified Pearl Specialist, Wong Chee Sheun is the Co-Founder and Creative Director of Qlassico, a fine jewellery house transforming profound insights into modern heirlooms imbued with meaning beyond adornment.
