How to tell if my diamond necklace is real?

There are a few things you can do to tell if your diamond necklace is real. First, check for a stamp of "GIA" or "AGS" on the diamond. These are two of the most respected gemological institutions in the world and their stamps guarantee that the diamond is real. Second, hold the diamond up to your ear and listen for a high-pitched ringing sound. This is called "brilliance" and it's one of the things that makes diamonds so special. Finally, look at the diamond in a variety of different lights. Real diamonds will sparkle in any light, whereas fake diamonds will often only sparkle in direct sunlight. If you're still not sure, take the diamond to a qualified jeweler for an evaluation.