How To Tell The Difference Between Moissanite And Diamonds?

The only way to tell that something isn't diamond with 100% certainty (aside from scientific inspection) is if it fails to pass the four C's of diamonds. If moissanite doesn't have any flaws or inclusions and has been cut well enough, clarity should be the only factor that will give it away.

It is important to know whether moissanite will pass a diamond test. This includes the clarity and color of your stone.

Diamond moissanite tester can be a helpful tool as part of a multi-stage test, but should not be solely relied upon. These little pens are a helpful way to separate out CZ from diamond. But that should be the beginning and end of their use. Why? Because other gems also have high conductivity (such as moissanite) and because the testers themselves notoriously malfunction. Reasons I have seen these testers fail include user error (stones will not test correctly if the point touches metal), low battery, or age/abuse of the pen.

What makes a good diamond tester?
There are many things to consider when buying a diamond tester.

To distinguish a diamond from moissanite, first make sure the device has electrical conductivity. For greater accuracy, the most recent models on the market combine heat/electricity tests.

Another good feature is having a metal detector that signals if you accidentally touch part of the metal setting instead of the stone.

Your tester may not recognize metal and it could indicate that you are holding a genuine diamond when you accidentally touch the setting.

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If all stones to be tested in the polariscope were completely transparent, unstrained, flawless, single crystals cut in spheres, the polar scope test  (gem polariscope or gemstone spectroscope) would offer no problems. However, most gemstones are flawed, many are twinned, some are aggregates of tiny crystals, the majority are faceted, and frequently they are mounted. Frosted or poorly polished surfaces may also affect results. A brief analysis of the manner in which light behavior is affected by these conditions is essential to an understanding of the common polariscope reactions.

Singly-Refractive Stones.
Remember that light is not polarized in singly-refractive crystals, it may pass while vibrating in any plane. There are an infinite number of vibration planes at right angles to any given direction of transmission. Within these materials, light is usually refracted or reflected in a normal manner, but not polarized. An exception occurs when stones are under some degree of internal strain.

Doubly-Refractive Stones
The simpler class of doubly-refractive single crystals is that called uniaxial. They are so called because they have one optic axis, or direction of single refraction. The planes of vibration consist of planes oriented as shown in Figure D. Vertical planes converge in the center, so that from the top an infinite number of vibration planes exist about a given point.

CONFIRMATION OF SINGLE OR DOUBLE REFRACTION.
It is clear from the above discussion that the ideal reaction for a singly-refractive stone is to stay dark when rotated in the polariscope's dark position, for the doubly-refractive stone, darkening very 90° is the classic reaction. It is equally clear that the singly refractive stone seldom reacts in the classic manner. In the following paragraphs, methods of checking results are given.

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