Does Moissanite Pass Diamond Tester

Does Moissanite Pass Diamond Tester?

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Moissanite is undoubtedly the best diamond choice on the market. It is the stone that’s most similar to diamond in regards to its look and various other vital characteristics.

One question you may have when buying moissanite is Does Moissanite Pass Diamond Tester?

The answer is YES! Moissanite will pass as a diamond when using a regular diamond tester. Basic diamond testers primarily measure the thermal conductivity of gemstones, not their electrical conductivity. This means these testers can’t differentiate between diamonds and moissanite, as moissanite also conducts heat.

In this blog post, we will share the tools that can accurately distinguish the two stones in addition to providing more information on the distinctions between diamonds and also moissanite.

What Is A Diamond Tester?

When a person refers to a “diamond tester”, most individuals indicate a handheld “pen” tester that determines a gemstone’s thermal conductivity.

‘Diamond testers’ principle of operation is based on the fact that various gemstones perform heat differently. Heat will go through a diamond in a different way than it would certainly via cubic zirconia or glass. The tester is made in a way that enables it to properly suggest if the stone in question is really a diamond or a few other treasures.

There are likewise testers that make use of electric conductivity to check stones, the principle is basically similar. If the electric conductivity is checked, the tester determines the speed and the amount of electricity present that passes through the gemstone in question.

Does Moissanite Pass Diamond Tester?

Diamond Tester

Yes! The diamond tester is one of the most common/ basic gemological equipment made use of to check diamonds. A fundamental diamond tester just examines thermal conductivity. Which indicates it can distinguish diamonds and moissanite from other stones.

Nevertheless, this technique is not really reliable when it is utilized to separate moissanite and diamond. Unlike fake diamonds and various other gems, moissanite is likewise an effective conductor of heat. Therefore, when using a diamond tester that discovers thermal conductivity, moissanite will certainly pass as a diamond.

Despite having well-known flaws, they are a valuable tool for jewelers and gemologists. To be able to distinguish both gems, you’ll require another sort of tester.


Considering that Moissanite is (very little) electrically conductive, specific Moissanite testers were developed. Moissanite testers just measure electrical conductivity– so they can conveniently compare diamonds and Moissanite As diamonds are not electrically conductive.

If you’ve decided that you want to acquire a diamond tester, there are several things you should be seeking.

  • First, see to it that the tool makes use of electric conductivity to protect a diamond from moissanite.
  • One more excellent feature is having a metal detector that signals if you inadvertently touch a part of the metal setting instead of the stone.

A number of today’s diamond testers are multi-testers, they gauge both thermal as well as electrical conductivity. Multi-testers are undoubtedly a lot more expensive, however, you will get accurate outcomes.

To learn more about the difference between moissanite and diamonds, check out our complete guide to moissanite rings.

Other Options for Testing Your Moissanite

There are lots of effective ways of testing for moissanite. A specialist can tell the difference between a diamond and also moissanite promptly by considering them under magnifying. Moissanite shows “double refraction,” while diamond is a single refraction.

We won’t dive as well far right into the scientific research behind it but, simply put, when a solitary beam of light goes into the crown of twice as refractive gems, two beams of light will exit.

A singly refractive gemstone such as a diamond will certainly see one beam of light enter as well as continue to be intact as it departures, unbroken.

Yet only the experienced eyes can see it quickly under a 10x magnification lens. When browsing the side elements of a Moissanite under magnification, the culet will certainly show up doubled/fuzzy. Diamonds do not show this attribute. So, this is a simple way to evaluate Moissanite.

Unfortunately, unless you have actually seen a lot of diamonds as well as equally as much moissanite, you most likely can not tell the difference.

jewelry magnification lens

Equipped only with the naked eye, the most effective method to see the difference is to have a comparably sized diamond and also to compare side-by-side. You’ll observe that moissanite, as well as diamonds, have a different fire.

In gemology, the term ‘fire’ describes the vivid glimmers (or flashes) that you observe as you relocate the ring under the light. Moissanite’s refractive index is substantially higher than diamond’s which is why Moissanite is fierier. Moissanite makes quick flashes of rainbow shade when relocating the stone around. This disco sphere result can be more pronounced in the sunshine.

Like a diamond, the larger the moissanite the even more color you can see and also the easier it is to differentiate it from a diamond. Based upon the amount of fire shown by a given stone, comes to be far more difficult as the stone size lowers.

One other, fairly low-tech, way to identify diamonds from Moissanite, is by comparing weight as well as dimension dimensions. This requires the stone to be loose.

Because moissanite is around 10% lighter than a natural diamond. If you weigh and measure a diamond or Moissanite, you must be able to differentiate both.

Can Cubic Zirconia Pass A Diamond Tester?

Cubic Zirconia ring

Presently, only All-natural diamonds, laboratory diamonds, and also moissanite can Pass the diamond tester.

CZ is an excellent heat insulator. When you examine a CZ with a diamond tester, usually the copper probe is electrically warmed and also kept at a specific elevated temperature by a micro-computer-regulated heater and thermostat.

When the probe is touched to a diamond, warmth swiftly transfers into the diamond, reducing the temperature level of the probe which causes the computerized circuit to enhance the power to the probe’s heater to attempt to maintain the configured temperature level. The foregoing triggers an LED to light, suggesting that the stone is likely a diamond.

If the probe is touched to a CZ, warmth does not rapidly move into it since it is a bad conductor of thermal (heat) energy. Hence the test tool LED does not brighten.

Distinguishing CZ from diamond is just one of the most important uses of thermal conductivity pen testers.

Learn more about Moissanite Vs Cubic Zirconia


In Short, If the warmth conductivity test is utilized, it’s frequently difficult to differentiate moissanite from the diamond. The moissanite is(slightly) conductive to electrical power, but this distinction can just be spotted with specialized equipment.

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Ring Size Guide

ring size guide
ring size guide

This is a chart that will be extremely helpful for you to determine the ring size that you need. You can either make use of a tape or a small piece of string to measure the area that will be occupied by the ring. When it becomes a complete circle, make a mark on such string. This will be helpful for you to compare with the chart that is mentioned below.

Inside Dia. Inside Circ. Size
14.1 44.2 3 F 44 4.25
14.5 45.5 3.5 G 45.5 5.5
14.9 46.8 4 H 47 6.75
15.3 48 4.5 I 48 8
15.7 49.3 5 J-1/2 50 9.25
16.1 50.6 5.5 K-1/2 51 10.5
16.5 51.9 6 L-1/2 52 11.75
16.9 53.1 6.5 M-1/2 53 13.25
17.3 54.4 7 N-1/2 54 14.5
17.7 55.7 7.5 O-1/2 56 15.75
18.1 57 8 P-1/2 57 17
18.5 58.3 8.5 Q-1/2 58 18.25
19 59.5 9 R-1/2 60 19.5
19.4 60.8 9.5 S-1/2 61 20.75
19.8 62.1 10 T-1/2 62 22
20.2 63.4 10.5 U-1/2 63 23.25
20.6 64.6 11 V-1/2 64 24.75
21 65.9 11.5 W-1/2 66 26
21.4 67.2 12 X-1/2 67 27.25
21.8 68.5 12.5 Z 68 28.5
22.2 69.7 13 Z+1 70 29.75
22.6 71 13.5 Z+1.5 71 31
23 72.3 14 Z+2 72 32.25
23.4 73.5 14.5 Z+2.5 73.5 33.5
23.8 74.8 15 Z+3 75 34.75

Other Tips

1) Measure your finger in warm temperatures at the end of the day.

2) If your knuckle is a lot larger than the base of your finger, measure both the base of your finger and your knuckle and select a size between the two.

3) When considering a wide band, move up a size from your measurement, for comfort’s sake.