These are timeless and classic pearl gold plated stud earrings. They are very lightweight(6.6 grams) and have a beautiful luster. These are genuine, natural white pearls. The semi-round pearl is approximately 10mm and the rice pearl is approximately 12 x 14mm. What is the difference between a cultured pearl and a natural pearl? Both are real pearls! Natural and cultured pearls are formed when an irritant enters the mollusk or oyster, causing it to respond to the irritant. The difference is that when cultivating pearls, the irritant is purposely placed inside the oyster through human intervention.