Elegant ear studs of real freshwater pearls. The ear studs are made of high-quality 925 silver and have the size 5x5mm. Would you like more information about 925 silver? Click here. Real freshwater pearls are rough. You can test the pearls for authenticity by grinding them with your teeth. You will then feel a slight abrasive effect. Fake pearls are smooth and will slide over your teeth without resistance. This is the best known way to test pearls for authenticity.