The value of a Pearl can vary dramatically depending on factors such as type, size, color, surface quality, and more. However, the value of a wild pearl is higher than a cultured pearl, and on average, a natural number is bought and sold in foreign markets from 300 to 1500 dollars. In Iran, the advertisement of all kinds of pearls is published on online buying and selling platforms, whose prices are variable.

Freshwater pearls come in a wide range of shapes, sizes, and colors, and are almost identical to Akoya pearls, but are less expensive and can be bought and sold for between $50 and $2,000 a string. Another type of pearl is Tahitian, which is seen in dark colors. A string of Tahitian pearls can cost anywhere from $500 to over $25,000, depending on size and quality. But the most expensive pearl is the South Sea type, which happens to be the largest pearl as well. A string of South Sea pearls can range from $1,000 to over $100,000, according to the pearlsource.

How to calculate and price pearls depends on the following factors:

• The brilliance of the pearl: the more light it reflects when the light shines on its surface, the brighter the pearl is and the higher its price.
• Symmetry: It is very difficult to find a pearl that is perfectly one handed and round, then perfectly oval pearls. Therefore, if such pearls exist, they will be very precious.
• Color of pearls: The color of pearls must be completely natural and pure. The rarer a color is, such as pink and orange, the higher its price.
• Pearl surface: If a pearl has a smooth and polished surface, it will be more valuable.
• Location: Natural pearls are more expensive than laboratory pearls. Also, open water natural pearls have the lowest price and South Sea natural pearls have the highest price.
• Size: It is natural that pearls, like any other stone, are more valuable the bigger they are.