The Division of Labor Behind Every Pearl: The Uwajima Production Hub

Uwajima is a major production hub, accounting for roughly 30-40% of all pearls produced in Japan. Its calm inland sea and intricate rias coastline create the perfect environment for cultivating Akoya oysters. But pearl farming isn't a job that can be handled by a single artisan or company alone.

There are specialists who raise the Akoya oysters, others who create the nuclei, those who manage the cultivation, and still others who handle the final processing and sorting. Each expert plays a distinct role, collaborating to bring a single pearl to market.

"If you tried to do everything yourself, you'd run out of time and energy. That's why, as a region, we've established this division of labor."

This system of specialization was born out of necessity, given the immense time and labor required. The Uwajima pearl industry thrives on a framework where the entire community unites, leveraging its rich natural environment and sophisticated techniques to cultivate high-quality pearls.

A Surgical Procedure for Oysters: The Nucleus Insertion Process

Within the world of pearl farming, the most critical and nerve-wracking step is "nucleus insertion." This procedure involves inserting a spherical bead, which will become the pearl's core, along with a small piece of tissue from the mantle, into the body of an Akoya oyster.

Doi Pearl often compares this process to a human medical operation. Before insertion, the oysters undergo "conditioning," a step that puts them into a dormant, sleep-like state. Making an incision while the oyster is active would cause it significant stress.

The mantle is the iridescent, pearl-producing tissue found on the inner side of the shell. This piece of mantle envelops the nucleus and, through repeated cell division, secretes layers of nacre, gradually forming the pearl.

"A single person will handle 600 to 700 oysters a day. And we keep this pace up for months on end."

While it may look like repetitive work, it is, in fact, a constant series of split-second decisions, assessing each oyster's condition in an instant. The precision of this single step determines the outcome that will only be revealed one or two long years later.

One Year or Two? A Choice Between Time and Risk

After nucleus insertion, the oysters are given time to recover before being returned to the sea. From that point on, the pearl begins its slow growth inside the oyster's body.

Pearls harvested within a year are called "tounenmono" (first-year pearls). Those left to grow for another year are "koshimono" (second-year pearls).

A pearl cultivated for two years is more likely to have a thicker nacre layer and a deeper, more profound luster. However, that extra year always comes with significant risk.

"Deciding to wait two years means being prepared to lose more than half of your oysters."

More time doesn't guarantee a better result. The oyster's health, the marine environment, water temperature, and nutrient levels—the outcome is heavily dependent on the specific conditions of that year.

"Younger oysters can sometimes 'act up,' just like people. Depending on their age and condition, some are better suited for the process than others."

Pearl farming is a profession built on faith in the passage of time, but it is also one that requires the wisdom to know when to let go.

Harvesting the Pearl: The Moment of Revelation

After spending sufficient time in the sea, the oysters are ready for a process called "tama-dashi," or pearl harvesting. This moment, when the shells are opened to retrieve the pearls from within, is a special time for everyone involved in pearl farming.

"You truly never know until you open it."

There's no guarantee that the pearl you've been hoping for will be inside. If an oyster has weakened along the way, the nacre layers might not be thick enough. In some cases, a pearl may not have formed at all. Even so, the sudden glimmer of a single brilliant pearl makes all the past effort worthwhile.

"That moment is why we decide to do it all again."

Harvesting is a process where the result is everything, yet it also marks the beginning of the next farming cycle.

What Makes a Great Pearl? Why Nacre Thickness Comes First

The value of a pearl is generally determined by six factors: maki (nacre thickness), luster, surface imperfections, color, size, and shape. Among these, Doi Pearl prioritizes "maki" above all else.

"Maki" is the measure of how thick the layers of nacre are on the nucleus. A pearl with thick maki has a deep color and a brilliant shine when it catches the light.

It's also more durable, meaning it can be cherished for a lifetime.

"A pearl with thin nacre will lose its value over time."

Even if its shape is slightly irregular, a pearl with good maki is highly valued. The quality of the maki gives even free-form baroque pearls their unique character.

This standard comes from a deep well of experience, born from inspecting countless pearls.

Sorting and Processing: The Journey to a Finished Product

Not every harvested pearl makes it to market as is. Each one is meticulously sorted based on its surface condition, the evenness of its nacre, and its color.

To maximize their beauty and ensure stable quality, many pearls undergo processes like bleaching and color toning. It's only then that they attain their value as refined jewelry.

Should the natural color be preserved, or should it be adjusted for a specific use? This, too, requires careful judgment.

"It's not as simple as 'natural is good, and processed is bad.'"

For Doi Pearl, the ultimate goal for a pearl is to be cherished and worn for years to come by its owner.

A Job at the Mercy of Nature: Why They Persevere

In recent years, the environment for bivalves has drastically changed due to rising sea temperatures and viruses. Akoya oysters are no exception, and some years have seen mass die-offs from unknown causes.

"Since we work with nature, it's beyond our control."

When asked why Doi Pearl continues this work despite the challenges, the answer was, "This business ends the moment we lose our connections—our ties to the sea and to people."

Encounters with people, bonds with the local region, and the relationship with the sea—pearl farming is built on a foundation of these connections.