How can you tell real stud diamond earings?

To identify real stud diamond earrings, first check for certification from a reputable gemological laboratory, which verifies the diamond's authenticity and quality. Examine the earrings closely for clarity and brilliance; real diamonds have a distinct sparkle and clarity that synthetic stones often lack. Additionally, look for small markings, such as "GIA" or "IGI," on the metal, indicating a genuine diamond. Lastly, consider having them appraised by a professional jeweler for an expert opinion.