Q：How can you distinguish freshwater pearls from saltwater pearls?
A：Freshwater pearls and saltwater pearls can be distinguished by several characteristics:
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Location of Cultivation: Freshwater pearls are cultured in freshwater bodies such as lakes, rivers, and ponds, while saltwater pearls are cultured in oceans, seas, or saltwater bays.
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Type of Mollusk: Freshwater pearls are produced by mussels, typically of the Hyriopsis cumingii species, whereas saltwater pearls are produced by oysters, such as the Pinctada fucata (Akoya), Pinctada maxima (South Sea), and Pinctada margaritifera (Tahitian).
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Shape and Size: Freshwater pearls tend to be more irregular in shape and smaller in size compared to saltwater pearls. However, due to advancements in pearl culturing techniques, freshwater pearls are now available in larger sizes and more uniform shapes.
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Color: Freshwater pearls often come in a wide range of colors, including white, cream, pink, lavender, and various pastel shades. Saltwater pearls also come in a variety of colors, but certain types, like Akoya pearls, are commonly white or cream with rose overtones, while Tahitian pearls are known for their darker hues such as black, gray, and peacock green.
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Luster: Saltwater pearls typically have a higher luster or reflective quality compared to freshwater pearls. This is because the nacre (the substance that forms the pearl) tends to be thicker in saltwater pearls due to the longer cultivation time.
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Price: Generally, saltwater pearls are more expensive than freshwater pearls, partly due to their rarity and longer cultivation process.
By considering these factors, you can distinguish between freshwater pearls and saltwater pearls. However, it's essential to note that there can be variations within each type, and professional gemologists may use specialized equipment and techniques for precise identification.
