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How to tell if your diamond is a fake

Hello and welcome to article that give you little tips about your diamond jewelry. Okay, so you finally have the engagement ring of your dreams. It's perfect, but your fiancé’s says he got such an amazing deal that you start having doubts as to whether or not your diamond is real.


You want to know for sure and there are a few ways you can test your diamond yourself. We will share some of them with you and also tell you which ones work and which only partially work.

Before we begin, you will need some tools which are:

  • A magnifying glass
  • A ten power jeweler’s loupe
  • A plate glass
  • A newspaper
  • And a black light

Step one: the Scratch Test

You've heard that diamond is the hardest substance on earth, and a piece of diamond can scratch glass. That’s true, but many other gemstones do as well. So, even if your diamond is real you may damage it by scraping across glass. So leave this offensively test from the diamond.

Step two: the Fog Test.

Real diamonds disperse heat instantaneously. You can tell if your diamond is actually diamond by fogging it up like a mirror. If it stays fog for three to four seconds or longer, it's probably a fake one. A real diamond will clear instantly. Just a little bit of cautions when you perform this test you must make sure that your diamond is completely clean and free from oil or grease.

Step three: the Transparency Test

This do-it-yourself just only works if your diamond is loose, by all means, it hasn’t been set in the jewelry. After first making sure it is clean, place your un-mounted diamond on top of newsprint with the pointy side-the pavilion, facing up toward you. If you can read the newsprint clearly through the stone, then your diamond is most likely a fake, probably a cubic zirconia or CZ.

Genuine diamond has extremely high refractive index and scattered light as it passes through. This caused the newsprint look a little blurry

Step four: the Inclusion Test

Nearly all fake diamonds have one thing in common; none has any inclusions or internal blemishes. So if you didn't pay an arm and a leg for your diamond, yet it has perfect clarity, chances are you have a fake.

However, there could be situation that you could see natural inclusions in the pieces of jewelry that you are looking at if natural gemstones like colorless sapphire, or colorless zircon were represented as diamond. But again, those natural imitations are always have either physical, or optical properties different than the real diamond.   

Step five: the Black light Test

You might have heard that real diamonds appear fluorescent blue under a black or ultraviolet light. Well, almost only about one-third of all diamonds will look fluorescent Blue. Ninety nine percent of fakes don't look blue. So, while you could do this test yourself at home with store-bought black light, it wouldn't tell you much. Don't bang on the black-white test

Steps six: Detecting Treated Diamonds

Some real diamonds have flaws, flaws that diamond processing company fixed by injecting liquid silica into the crack of diamond. This clarity enhancement is similar to the way chips in car windshields are fixed. The problem is that these diamond fixes aren't permanent. Exposure to the sun, heat, and even some household cleaners will turn the silica different colors or make it fall out altogether.

You can often spot filled diamonds with a ten power loupe. In most states, it is against the law to sell you treated diamond without first telling you. Again, with this test, you will need to do your diamond un-mounted, or unset from your piece of jewelry.

Turn the diamond onto its table (face up), point side’s up and examine it carefully. If you see flashes of single colors when you look parallel to the suspected filled fracture, then you're looking at a fracture filled treated diamond.

If you see flashes with many rainbow colors at once, then you are probably looking at a fracture of an untreated diamond.

Ooh, he really didn't get a heck of a deal and rush to church. It is a real diamond, done.