The skin of natural pearls is covered with layers of calcium carbonate, which makes them rustle when they are lightly rubbed against each other. Substitute pearls (that is, plastic beads cover the pearl layer first or shells are ground and then covered with the pearl layer) have smoother surfaces, and they will feel slippery when they are lightly ground.

2. Weighing method:

The specific gravity of seawater pearls is 2.54~2.78, that of freshwater pearls is 1.77 ~ 1.86, and the substitute pearls are made of plastic with a specific gravity of 0.95. So when you look at it with a hand scale, you can feel that the substitute pearls are lighter and the natural pearls are heavier.

3. Natural pearls will feel cold when they touch the skin. Breathe into the pearl with your mouth, and the surface will fog. False beads feel smooth and warm when they touch the skin.