The inner layer is unique because
The inner layer is unique because of its iridescence. A characteristic that jewelers and the public alike find very attractive. The same characteristic is primarily due to the thickness of the platelets comparable in size to the visible light’s wavelength, which translates to about 0.5 micrometers. This produces a play of light due to the different wavelengths which occurs when light is allowed to pass through it from different angles.
Major sources of mother of pearl finds come from the freshwater mussels. This species normally live in the waters of Asia, Europe and the United States. The same mother of pearls can also be seen in pearl oysters of warm tropical waters as well as the abalone of the Japan, California and the Pacific.
Natural mother of pearls are sources of pride and joy to collectors of these items. Knowing that nature takes time to create them in such a unique slow process has added more depth to its beauty and rarity.
In 1916, Kikichi Mikimoto harvested the first large lot of cultured akoya pearls in Ago Bay, Japan. These pearls were unlike any the world had known. They were whole pearls with a mother-of-pearl nucleus created by a culturing method known as grafting. A small bead was placed in the host oyster’s reproductive organ along with a small piece of donor mantle tissue – the catalyst of pearl sac creation and nacre deposition – the formation of a pearl.
Today akoya pearls are still a favorite staple in every woman’s jewelry collection and the most popular type of pearl sold at fine jewelry stores around the world. They are known for their perfectly round shape, sharp luster, and brilliant white body colors with hints of rose and silver overtones.
Selecting a fine strand can be very tricky, however. Not unlike diamonds, the quality of a strand will determine its beauty, durability, and ultimately its price. Consumers need to be aware of the Gemological Institute of America’s (GIA) five value factors developed in 1967, and used to assess the quality of an akoya pearl. They are size, shape, luster, nacre thickness, and surface.
Akoya pearls are often relatively small. The average size is 7 mm in diameter, and the average princess length is 17 to 18 inches. Most fall into the size range of 3 mm to as large as 10 mm. When all other value factors are consistent, larger akoya pearls are more valuable.
While shape is an important value characteristic of other types of cultured pearls such as freshwater and Tahitian, akoya pearls are generally very round. This is due to the perfectly spherical bead implanted into the oyster. Nacre is deposited around the bead and most akoya pearl production is round as a result. Other shapes such as symmetrical drops and baroques do occur, but round pearls are considered more valuable.
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