5 ways to spot a fake diamond

One of the most common questions that gemologists are asked is how to tell the difference between a real diamond and a fake stone.

We spoke with Reyne Hirsch, a 20th-century decorative arts expert and consultant for the global online marketplace Lofty, about how to tell when a diamond is real, and when and why to take it to an expert.

Whether it's with jewelry you inherited or something you found at a garage sale, it's easy to do a few simple DIY tests. That necklace you think is just cheap costume jewelry could end up costing a small fortune.

Here are five easy ways to tell if the stone you have is actually a diamond.