How to Tell if a Diamond is Real. 5 (100%) 2 votes. About Sebastian Your Diamond Teacher. Sebastian Naturski loves to write about diamonds and share his knowledge with his readers. When he is not working on his website he is studying law at Humboldt University of Berlin. In this video I talk about some of the ways of how to tell the difference between a real and fake diamond. Stay tuned for the end of the video for a smashing good time! I am not an expert and was. 4. How to Tell if a Diamond Is Real With a Black Light You'll need a black light for this one, obviously. Once you have it, turn off the lights and hold the diamond in front of the black light. Most diamonds will reveal blue florescence under a black light; therefore, you'll see a medium to strong color of blue, which means the diamond is real. You have a jewel and you do not know if the bearing is bright diamond or not? Pay attention to the following article, as we explain here at OneHowTo.com how to recognize a diamond.With these simple tips, you will know whether your brilliant diamond is real or not. 8. How to Tell if a Diamond is Real using Sunlight. The way that diamonds reflect light is unique: the inside of a real diamond should sparkle gray and white while the outside should reflect a rainbow of colors onto other surfaces. A fake diamond, on the other hand, will have rainbow colors that you can see inside the diamond as well. 9. How to Tell if a Diamond is Real. It is common knowledge that women love jewelry, particularly diamonds. Even the proverb “Diamonds are a girl’s best friend’’ confirms the statement. But, just as there are many fake friends, there are also fake diamonds. It's easy to tell if a diamond is real. One of the most common questions that gemologists are asked is how to tell the difference between a real diamond and a fake stone. How to Tell if a Diamond is Real. Finding out whether or not your diamond is real is a tantalizing proposition — do you want to know without a doubt? Most curious citizens turn to a professional jeweler in order to suss it out. But you don't have to be Sherlock Holmes to tell the real from the duds. A little bit of l. How to Tell if a Diamond is Real or Fake – Complete Guide. Last Updated On: March 3, 2020. Bottom Line Recommendation: This guide is for people who own jewelry pieces or collections and want to know if they are real.