Q：How to distinguish between nucleated pearl and non-nucleated pearl?

A：To distinguish between nucleated pearl and non-nucleated pearl，you can look at the following aspects：

1. Appearance and Shape: Nucleated pearls tend to have a more uniform shape and a smoother appearance since they are grown with human intervention, often with a nucleus implanted within the mollusk.  Non-nucleated may exhibit irregular shapes and surface imperfections.

2. Structure: Nucleated pearls typically have a more uniform structure due to the controlled environment in which they are grown. Non-nucleated may have irregularities in their structure since they are formed spontaneously within the mollusk.

3. Growth Time: Nucleated pearls have a relatively shorter growth period, typically taking a few years to develop, while Non-nucleated may take much longer, sometimes decades.

4. Cost: Nucleated pearls are generally less expensive than Non-nucleated due to their controlled production process. Non-nucleated are rarer and command higher prices.

5. Identification: Professional jewelers can use tools such as microscopes to examine the internal structure of pearls. Nucleated pearl often exhibit a distinct nucleus, while Non-nucleated may not.