Dominic Stone
Mussels are known to produce pearls, which are formed when a foreign object enters the mussel and is coated by the animal with nacre, the same material it uses to build its shell. This process can be replicated by humans, who can introduce a bead into the mussel to produce cultured pearls. While mussels can produce pearls of various colours, there are no naturally golden freshwater pearls. The golden colour of some pearls is achieved through dyeing or laser treatment.
| Characteristics | Values |
|---|---|
| Do mussels produce golden pearls? | No, there are no naturally golden freshwater pearls. |
| Mussels produce pearls when | A bit of foreign matter lodges in them, and they use nacre to coat the foreign matter. |
| Nacre | A type of rind that gives pearls their sheen. |
| Nacre composition | Organic secretions with a carbon-based mineral called aragonite. |
| Golden colour | Induced with dye in something that looks like a pressure cooker. |
| Golden pearls worth | A golden pearl is 10 times more expensive than a black pearl. |
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What You'll Learn
Natural vs. Cultured Pearls
Natural pearls are formed through an accidental irritant, such as a grain of sand, a parasite, or the tip of a crab claw, that enters a pearl-bearing oyster or mollusk shell. The oyster or mollusk then secretes layers of a substance called nacre to protect itself from the irritant. This defence mechanism eventually creates a natural pearl. Natural pearls are considered extremely rare, and most natural beds of pearl-producing shells have been depleted due to over-harvesting. They are often found in museums or sold at antique auctions and can fetch high prices.
Cultured pearls, on the other hand, are formed with human assistance. Pearl farmers carefully insert a tiny bead or a small piece of tissue as the irritant to encourage the growth of a pearl. Cultured pearls are real, genuine pearls, but they are different from natural pearls because of human involvement in their creation. They are the pearls used to make almost all jewellery on the market today. Cultured pearls can be grown in both freshwater and saltwater, with most freshwater pearls coming from China, and saltwater pearls grown across Australia and Asia.
The main difference between natural and cultured pearls lies in the way the secretion process of nacre starts. Natural pearls have a more "organic" or baroque appearance and may not be as well-shaped or round as cultured pearls. This is because the nucleus inserted into the oyster for cultured pearls is round. However, because the oyster is a living creature, it does not always guarantee a perfectly round pearl, and these are very rare.
The value of a pearl depends on various factors, and it can be difficult to tell the difference between cultured and natural pearls without a gemological X-Ray examination. While natural pearls are usually more expensive due to their rarity, the colour and appearance of a pearl are determined by the species of the shell, regardless of whether it is natural or cultured.
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How Pearls Form in Oysters
Oysters are bivalves, meaning their shells consist of two parts or valves. These valves are held together by an elastic ligament, which usually keeps the valves open so the oyster can eat. As the oyster grows, its shell must also grow. This growth is facilitated by the mantle, a thin layer of tissue that lines the inner part of the oyster's shell. The mantle has glands that extract minerals from the water and convert them into the building blocks of its hard shell.
The mantle secretes calcium carbonate minerals, along with an organic protein, that together form the shell. The oyster's shell, or exoskeleton, has three layers. The outermost layer is the outer proteinaceous periosteum, followed by a prismatic middle layer. The innermost layer, known as the nacre layer, lines the inside of the shell and is also known as the "pearl layer" due to its iridescent, light-reflective qualities.
The process of pearl formation begins when a foreign substance, such as a parasite, slips into the oyster between the mantle and the shell, causing irritation. The oyster's natural response is to encapsulate this irritant, thereby protecting itself. The mantle covers the irritant with layers of nacre, the same substance used to create the shell. Over time, these concentric layers of nacre will form a pearl.
Some oyster species can secrete multiple layers of nacre daily, but each layer is incredibly thin, typically measuring around one thousandth of a millimeter. It usually takes an oyster at least 24 months to create a natural pearl that is up to 5 millimeters in diameter.
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Are Clams and Mussels Different from Oysters?
Clams, mussels, and oysters are three famous delicacies commonly consumed worldwide. They are all bivalves, meaning they are filter feeders with two shells. However, there are some differences between them in terms of taste, habitat, and appearance.
Clams have stout, oval-shaped shells of similar sizes, with a light tan, brown, or white colour. They are primarily found in the sandy or muddy sediment of bays, seas, and oceans, and can be farmed or caught wild for consumption. Clams have a sweeter and saltier flavour with a slightly chewy texture.
Mussels have darker blue or black shells that are more oblong and triangular in shape and can have an iridescent sheen. They are found in both freshwater and saltwater, growing on rocks or clusters on the seabed or man-made surfaces. Mussels have a robust, sweet, and nutty flavour, with a tender and chewy texture. Additionally, mussels produce pearls. However, there are no naturally golden freshwater pearls. The golden colour is achieved by dying the pearls in a pressure cooker.
Oysters have irregularly shaped shells with a rougher texture and can be brown, white, or grey. They are found in saltwater habitats such as bays, estuaries, and oceans, attaching themselves to rocks or other substrates to create reefs or beds. Oysters are known for their briny, salty flavour with a slightly creamy texture.
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The Pearl Layer
The iridescent sheen of a pearl is created by layer upon layer of nacre, a type of organic secretion with a carbon-based mineral known as aragonite. This "brick-and-mortar" process is at least 200 million years old, according to the fossil record.
Nacre is produced by mollusks, including mussels, to reduce irritation caused by foreign matter that accidentally lodges inside their shells. The mollusk coats the foreign matter in layers of nacre, which is the same material it uses for shell building. The results of this process are luminous, glamorous, and can be very rare.
The layers of nacre are built up over time. In the case of cultured pearls, a nucleus is inserted into the pearl-producing mussel, and the longer it is left in the water, the more nacre forms around the nucleus, increasing the likelihood of creating a fine pearl. However, this process is not without risk, as approximately 25% of implanted oysters die each year they are left in the water.
The colour of pearls depends on the colour of their parent's mother-of-pearl. While pearls can be dyed unnatural colours, such as gold, these are generally worth less than white and natural-coloured pearls.
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The Controversy of Cultured Pearls
Cultured pearls are formed within a cultured pearl sac with human intervention in the interior of productive living molluscs. This process was first developed by British biologist William Saville-Kent, who passed the information along to Tatsuhei Mise and Tokichi Nishikawa from Japan. Kokichi Mikimoto, often considered the father of the modern cultured pearl industry, experimented with a wide variety of foreign matter to culture his oysters, including gold and silver beads, and bits of live mantle tissue from other mussels.
The process of culturing pearls has led to controversy, particularly in the United States. The discovery of valuable pearls in the 19th century led to a "pearl rush" in New Jersey, Ohio, and Wisconsin, as well as in backwoods Arkansas, dubbed the "Arkansas Klondike". This rush to find valuable pearls led to the near extermination of mussels in these areas and doomed several species to extinction. The process of culturing pearls requires the harvesting of mussel shells, which can be destructive to the mussels themselves. It is estimated that almost 90% of the weight of a cultured pearl may be comprised of North American shell.
The advent of modern culturing technologies has also halted the devastation of the world's natural oyster population, allowing pearl lovers around the world to purchase pearls at more affordable prices. Cultured pearls can be cultivated in seawater or freshwater bodies and come in a wide variety of colours and shapes, making them popular with jewellery designers and consumers.
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Frequently asked questions
Yes, mussels do produce pearls.
Pearls are made of layers of nacre, also known as "mother of pearl" or shell material. Nacre is a type of organic secretion with carbon-based mineral aragonite, which gives pearls their sheen.
Freshwater pearls are found in a variety of colours. However, there are no naturally golden freshwater pearls.
Golden pearls are formed by dying the pearls in a pressure cooker. The dye is usually peach or lavender.
Freshwater pearls are found in various rivers of the world, including Lake Biwa in Japan, China, and some tributaries of the Mississippi River in the United States.
