There are a few different ways to evaluate whether a pearl is authentic or fake:
Look at the surface of the pearl: Real pearls have surface imperfections, called blemishes, that are unique to each pearl. Fake pearls are typically perfectly smooth, so if the pearl you’re examining has a perfectly smooth surface, it’s likely a fake.
Check the Weight #
Real pearls are denser than fake pearls, so they will feel heavier for their size.
Check the Lustre #
Look at the lustre: Real pearls have a lustrous, glowing appearance that is difficult to imitate. Fake pearls tend to have a dull or matte finish.
Check the Drill Hole #
Real pearls are often drilled through the centre, and the drill hole will be perfectly round. Fake pearl drill holes may be uneven or have jagged edges.
Check for an "X" marking #
Some fake pearls will have an “X” marking on the surface to indicate that they are not real. This marking is not present on natural pearls.
Professional Evaluation #
Have a professional appraise the pearls: A trained gemologist or specialist can examine them and determine if they are real or fake. This is the most reliable way to determine the authenticity of a pearl.