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Well, if you're not a gem expert you will not be able to tell the cut and the clarity of the stone or even if its real. You can take it to a place that sells gemstones or even a pawn shop. They can tell you with a diamond tester if it is real or not: you can't tell if its real or not by looking at the metal band.

Reputable jewelers will offer a certificate of authenticity. Quality diamonds sparkle like nothing else in the world. You can even go to someplace like Sears and have them show you the difference between a diamond and a cubic zirconium.

An x-ray crystallograph can provide a reasonably high degree of assurance when it is used to identify smaller diamonds that were cut from a larger one. A cheap way to test a questionable gem is to drop it into clear mineral oil. A real diamond will remain visible because it has an optical density that is higher than (most) fakes and higher than the oil.

The best way is to take it to a certified gemologist for an appraisal.

A Few Simple Tests:

Heft test (weight compared to size):

A diamond with the same size of a "synthetic cubic zirconia" will be lighter in weight (carat).

Hardness Test:

Diamond can scratch "synthetic cubic zirconia" easily while "synthetic cubic zirconia" can't scratch diamond. This destructive test is not recommended but if required use apply on or below girdle area of stone.

Read through effect:

RBC (round brilliant cut) diamond when placed table down on written matter (generally a line or point is enough) and viewed from above the girdle (pavilion facets) will not exhibit read through effect whereas "synthetic cubic zirconia" will exhibit low read through effect.

Inclusions:

Some diamonds will have visible inclusions whereas synthetics, especially cubic zirconia will have white unmelted powder which sometime looks like gas bubbles.

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Q: How do you tell a real diamond from a fake?
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Related questions

How can you tell the difference between a real diamond or a fake?

scratch the diamond against glass...if it scratches its real if it doesn't its fake


How to tell if a diamond is real?

Supposedly the only way to distinguish the best manufactured white diamond from a real diamond is the fake diamonds are flawless, and no real diamond can be truly flawless. I always wondered about this though, because how hard would it be to add flaws to a fake diamond to make it appear real? So my opinon is there is no way to tell the difference between a real diamond and a fake diamond.


How do you tell the difference between a real diamond and a fake diamond?

if you breath on a diamond and the vapor dispear right away it a true diamond if it does not then it fake


How can you tell a diamond is not real without all the hytech stuff?

a real diamond can cut glass, a fake diamond cant.


How can you tell the difference between a diamond and a fake dimand?

A real diamond will cut glass.


Is it true that jewelry stores have testers that tell if a diamond is real or not?

Yes they actually have the eye scopes too to tell if its real or fake


How can an average person tell if a diamond is real?

If the diamond shines too much is of a frosty color,you may consider it fake.


How can one tell if a diamond is real or not?

A diamond, unlike a fake diamond, is extremely hard and can scratch nearly anything. A fake diamond would not be as hard. A jeweler with a microscope would also be able to determine the difference.


How can you tell in a silver diamond ring is fake?

A fake ring will have lots of color to it. You should also be able to see flaws inside a real diamond such as small air pockets. Real diamonds also have code numbers on them which only a diamond..


How can I tell if the stones in my ring are real diamonds?

Real diamonds will cut glass, though there is speculation that some fake diamonds can cut glass, and that you can damage a real diamond by cutting glass with it. Another way to tell is to hold the diamond up in the light. If you see any orange color from the diamond, it is fake, as real diamonds have every color EXCEPT orange.


Is a simulant diamond a real diamond?

No, a simulant diamond is a fake diamond.


Is there an easy way to tell a real diamond from a fake one?

The difference between a real diamond and a false diamond is hard to tell from appearance. But experts can determine the validity of the diamond by a magnified scope. This scope can extinguish the difference between the two by the color and density.