Buzz
If you plan to purchase pearl jewelry or own a family heirloom made of pearls, use the following tests to differentiate between real and fake pearls in just a few minutes. To avoid the worry of buying counterfeit items, learn to visually and tactilely identify the signs of genuine pearls.
Steps
Visual Inspection
Look for minor imperfections. Real pearls are rarely "perfect" and often have slight irregularities or flaws in their shape. The outer nacre layer reflects light differently across the pearl's surface. Most fake pearls appear "too perfect," with an absolutely spherical shape and uniform shine across the entire surface, lacking any dents or imperfections.
Tip: While extremely rare, perfectly round pearls do exist, but it is nearly impossible for a necklace to be made entirely of pearls with identical perfect roundness. If you see a strand of pearls where each bead is uniformly shiny and perfectly round, it is almost certainly fake.
Check for sharp luster. Jewelers often use the term "luster" to describe the light reflected from gemstones. Luster is a key factor that makes pearls appear radiant, so high-quality pearls should have a bright and sharp luster, giving them a glowing effect when light hits them. If you look closely, you should be able to see your reflection on the pearl's surface.
- The drawback of this method is that it cannot distinguish low-quality real pearls, as they may have a dull, lackluster shine similar to fakes. You should cross-reference the results of other tests in this article for more accurate identification.
Examine the overtone. High-quality pearls are often valued based on their overtone, which is the subtle color visible on the pearl's surface under light. Fake pearls typically cannot replicate this effect, as it is difficult to imitate. Therefore, if your pearl exhibits a soft, glowing overtone under light, it is likely genuine. Pearls with a white base and pink or cream overtones are particularly popular, though many other overtones exist, especially in darker-hued pearls.
- Since some real pearls may not display an overtone, this is not always a definitive indicator of authenticity.
Look for signs around the drill hole. Pearls strung into necklaces are usually drilled to allow threading, and you can use the drill hole to determine authenticity. Look for the following specific details:
- Sharp edges around the hole. Real pearls typically have very sharp drill holes (like a hollow cylinder), while fakes may have rough or rounded edges. However, older or heavily worn pearls may also have rounded edges. Fake pearls may have drill holes that curve outward instead of being perfectly cylindrical.
- Chipped paint or coating around the hole. Over time, beads rubbing against each other can cause the outer coating to peel around the drill hole. If you can see glass or plastic beneath the surface, it is definitely fake.
Look for a separation line between the nacre and the core in the drill hole. Real pearls almost always have a distinct outer nacre layer, while fakes often have a thin artificial nacre layer or none at all. If the pearl has a drill hole, use a magnifying glass to inspect the nacre. Genuine pearls (though not always) will have a clear line separating the nacre from the core (the inner part of the pearl).
Friction Method
Rub the pearl against your front teeth. Hold two or three pearls firmly between your index finger and thumb, then gently press them against the edge of your front teeth, moving them side to side. Real pearls will feel slightly "gritty or sandy" due to tiny imperfections in the outer nacre layer. Fake pearls made of glass or plastic will usually have a "nearly perfectly smooth" surface.
- Brush your teeth before this test to ensure they are completely clean, as leftover food particles can lead to inaccurate results.
Rub the pearls against each other. Hold the pearls between your fingers and gently rub them together, trying to feel the slight friction between them. Real pearls will create a small amount of friction due to the textured outer nacre layer. In contrast, fake pearls have a smooth outer coating, causing them to slide effortlessly against each other.
- Examine your hands closely after the test. Rubbing pearls together may produce a fine white powder, which could be nacre dust—a sign of real pearls.
Check if the pearls are perfectly round. As natural products, each pearl is slightly unique, much like snowflakes or fingerprints. Most pearls are not perfectly spherical; they may be slightly oval or have minor imperfections. If your pearls are perfectly round, they are likely artificial.
- Real pearls can be perfectly round, but such cases are "extremely" rare and often sold at a premium.
- Unsure if the pearl is perfectly round? Carefully roll it on a flat surface. If it doesn’t roll in a straight line, it’s not perfectly round.
Feel the coolness to the touch. For this method, leave the pearl outside for a while—don’t test pearls you’re currently wearing. Hold the pearls in your hand and focus on the sensation as your skin touches them. Real pearls will feel distinctly cool at first before warming up after a few seconds, similar to stepping barefoot on marble.
- In contrast, plastic pearls will feel room temperature and warm up quickly.
- Note: High-quality glass fakes can also feel "cool," so compare results with other tests if this is your first method.
Feel the weight of the pearl in your hand. Gently lift one or two pearls to gauge their weight. Genuine pearls typically feel heavier for their size, while fakes (especially plastic ones) often feel surprisingly light.
- This method isn’t foolproof, as it’s challenging to accurately judge the weight of small pearls. For more precise results, compare your pearls to others you "know" are real or fake. Even if you’re confident about the weight, confirm your findings with additional tests.
Advanced Testing Methods
Use a microscope to look for a scaly surface texture. A jeweler’s loupe with 30x magnification works, but a microscope with 64x or higher magnification is ideal. Real pearls have a labyrinth-like, scaly surface resembling a topographic map. This scaly texture creates the slightly gritty feel of genuine pearls.
- In contrast, fake pearls often have a surface with relatively uniform bumps, similar to the cratered surface of the moon.
Compare your pearls to certified genuine pearls. The tests above are easier if you have "real" pearls for comparison. Reach out to a jeweler and ask to compare your pearls with their certified ones, or borrow genuine pearls from friends or family.
- Use your intuition when testing others’ pearls. For example, avoid rubbing teeth or friction tests on someone else’s precious jewelry.
Seek professional appraisal. If you’re unsure about your pearls’ authenticity, take them to a jeweler or gemologist for evaluation. They have the tools, training, and expertise to identify real pearls and can also provide a valuation. However, this option can be costly, with even a simple appraisal costing over 2 million VND.
Use X-ray testing. In this method, a professional uses an X-ray machine to determine if a pearl is real or fake. Genuine pearls appear as translucent gray on X-ray film, while fake pearls show up as opaque white on negative film and opaque black on positive film.
Test with a refractometer. This method measures the amount of light passing through the pearl. A refractometer typically shows a refractive index between 1.530 and 1.685 for real pearls. The 0.155 difference between these values is called the "double refraction" of pearls, which creates their color under light. Experts use these properties to confirm authenticity.
Things to Avoid
Avoid relying on a single method to identify real pearls. Remember: all the methods mentioned above can occasionally yield incorrect results, so it’s best to use multiple tests for confirmation.
- For example, some real pearls polished with special techniques may feel very smooth during the tooth or friction tests, showing why relying on just one method can lead to mistakes.
Avoid the "burning" method. Some believe burning a pearl directly over a flame can distinguish real from fake. According to this myth, fake pearls will burn or melt, while real pearls remain unharmed. However, the reality is more complicated. While fake pearls are certainly damaged by fire, some real pearls can also be affected. Genuine pearls treated with artificial coatings may warp, lose their luster, or have their drill holes deformed after just a few seconds of burning.
- Additionally, real pearls conduct heat well and can become extremely hot when burned, so take precautions to avoid burns if attempting this test.
Be cautious of fake pearls with exotic names. Sellers may deceive you by giving pearls unusual names instead of highlighting their actual quality. For instance, Mallorca (or Majorca) pearls are named after a Mediterranean island but are actually fake and marketed to unsuspecting buyers.
Use intuition to estimate the pearl’s value. Genuine pearls vary widely in price depending on size, shape, overtone, and other characteristics. However, they are never dirt cheap. For example, a freshwater pearl necklace (the most affordable type) can still cost several million VND. If a seller offers an unbelievably low price for a pearl set, it’s likely fake.
- As a general rule, only buy pearls with certificates from reputable retailers or jewelers. Purchasing from street vendors or pawn shops carries a high risk of counterfeits. Refer to guides on buying real pearls for more specific advice.
Tips
- Remember, real pearls come in two types: "natural" pearls harvested from wild oysters and "cultured" pearls from pearl farms. Natural and cultured pearls differ slightly in color, nacre thickness, luster, and shape. Natural pearls are rarer and more expensive than cultured ones.
- If you need to clean "real" pearls, consult an experienced jeweler, as everyday solvents or cleaning solutions can permanently dull their surface. Fortunately, many jewelers now offer professional pearl cleaning services.
Warnings
- Be cautious when using the tooth-rubbing method on pearls. Hold the pearl firmly to avoid accidentally swallowing it.
- Minor scratches may appear on the pearl after rubbing it against your teeth or other surfaces. If this happens, gently rub the scratches with your thumb repeatedly, and they should disappear.
