Elegant earrings of real freshwater pearls. The earrings are made of high quality 925 silver and have the size 7x7mm. Would you like more information about 925 silver? Click here. Real freshwater pearls are rough. You can test the pearls for authenticity by grinding your teeth over them. You will then feel a light 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.