Simpukoilla

Simpukoilla, commonly known as the Japanese pearl oyster (*Pinctada fucata*), is a bivalve mollusk native to the coastal waters of East Asia, particularly Japan, China, and Korea. It is primarily cultivated for its production of high-quality pearls, which are renowned in the global jewelry industry. The oyster thrives in shallow, clean marine environments, often found attached to rocks or coral reefs.

The cultivation of simpukoilla pearls dates back centuries, with Japan being a leading producer. These pearls are typically round, lustrous, and come in a range of colors, including white, silver, and golden hues. The most prized varieties are often cultured using the nucleus method, where a small bead is inserted into the oyster to stimulate pearl formation. The resulting pearls are known for their exceptional brilliance and durability.

Simpukoilla pearls are classified into several grades based on size, luster, and surface quality. The term "akoya" is sometimes used interchangeably with simpukoilla, though it specifically refers to pearls from the *Pinctada fucata martensii* subspecies, a variety native to Japan’s Akoya region. These pearls are smaller, typically ranging from 2 to 10 millimeters in diameter, and are favored for their delicate appearance.

Beyond pearl production, simpukoilla also plays an ecological role in marine ecosystems. As filter feeders, they help maintain water clarity by removing plankton and organic particles. However, overharvesting and environmental degradation pose threats to wild populations, prompting sustainable aquaculture practices to ensure their continued availability. Today, simpukoilla remains a symbol of luxury and craftsmanship in jewelry, with demand driven by both traditional and contemporary markets.