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10 Facts About Moissanite Testing: Does It Pass the Diamond Tester?

Does Moissanite Pass the Diamond Tester?

Will Moissanite Pass a Diamond Tester?

The main tool used when distinguishing moissanite from diamonds is a diamond tester. These devices typically measure thermal conductivity, a property that diamonds excel at. However, moissanite (a silicon carbide-based gemstone) exhibits different thermal properties. Therefore, standard diamond testers that rely solely on thermal conductivity cannot accurately identify moissanite as a unique gemstone. As the name suggests, moissanite can pass the test with ordinary diamond testers on the market.

Principles of Diamond Testing: Thermal Conductivity and Electrical Conductivity

Jewelry stores generally have pen-like testers to detect and distinguish real and fake diamonds. The principle of a diamond tester is to transmit heat through gemstones and measure the diffusion rate of heat. Diamond’s molecular structure is C60, which is an excellent thermal conductor and can quickly dissipate heat, resulting in positive test results. However, different sizes of moissanite have different thermal conductivities, causing these traditional testers to perform poorly at accurately identifying moissanite.


The difference between moissanite and diamonds is its extraordinary brightness and fire, which outshines diamonds. Its silicon carbide composition gives these brilliant optical properties. Although very similar to diamonds in appearance, moissanite has different physical and chemical properties (hardness and molecular structure), which is why the test results vary.

Comparing Diamonds and Moissanite: Key Differences

Although moissanite and diamond have the same appearance, there are some key differences, and that is birefringence in moissanite versus single refraction in diamond. On closer inspection, this feature may be revealed. This is also the double refraction that makes moissanite look more sparkly.

Advanced Diamond Testing Technology and Moissanite

The new generation of diamond testers combines thermal conductivity and electrical conductivity measurements. This advance allows for a more accurate distinction between diamond and moissanite. Moissanite’s high electrical conductivity allows it to be accurately distinguished from diamonds in these tests. However, this type of equipment will only exist in some large laboratories and cannot be seen in jewelry stores.

The evolution of synthetic gemstones

The history of synthetic gemstones, especially moissanite, is not like the cultivation of laboratory diamonds. Moissanite was first discovered in meteorite craters. This kind of natural moissanite is extremely rare and can be called It is not an exaggeration to say that it is the rarest gem. When people later learned about its chemical properties, they began to cultivate stones that match its molecular formula. To this day, moissanite on the market is basically cultivated moissanite.

The discovery and rise of moissanite in jewelry

Moissanite was first discovered in 1893 by Dr. Henri Moissan in a meteorite crater. Initially mistaken for a diamond, its true nature was later discovered. Today, moissanite has become the number one choice for those looking for an affordable alternative to diamonds.

Technological Advances in Gemstone Testing

Advances in gem testing technology reflect the evolving landscape of the jewelry industry. From simple thermal conductivity testers to complex devices that measure multiple properties, the accuracy and reliability of gemstone testing has improved significantly.

Refractive Index and Fire: The Aesthetics of Moissanite

The refractive index of moissanite is higher than that of diamond, which is why you can clearly feel its sparkle. Especially under sunlight, moissanite will shine with its unique rainbow light. The strong light dispersion is also the reason why people choose it.

Hardness and Durability: Moissanite for Everyday Wear

With a hardness of 9.25 on the Mohs scale of mineral hardness, moissanite is one of the hardest substances on Earth, second only to diamond (10). This hardness ensures that moissanite is suitable for everyday wear and resistant to scratches and damage.

Impact on jewelry buyers and sellers

For buyers and sellers, the ability to identify gemstones is a way to build business trust and self-protection. Buyers can use it to ensure authenticity, and sellers can build industry reputation and user trust.

Types of Diamond Testers Available in the Market

There are many types of diamond testers available, from basic thermal conductivity testers to advanced dual testers that can measure both thermal and electrical conductivity. When choosing a diamond tester, consider factors such as accuracy, reliability, ease of use, and the ability to differentiate between different types of gemstones, including moissanite.

Emerging Technologies for Gemstone Verification

Advances in gem testing include the use of spectroscopy, computer imaging, and even artificial intelligence-driven analysis to provide more precise and comprehensive testing methods.

The role of artificial intelligence and machine learning in gem testing
AI is revolutionizing gem testing, providing greater accuracy and the ability to analyze large amounts of data for better gem identification.

In conclusion

Moissanite can still pass ordinary diamond testers on the market. Of course, the test results may differ depending on the grade of moissanite, because moissanite is graded (D\E\F\G\H\I) The higher the grade of moissanite, the clearer the appearance and clarity, and the price will be higher than other grades.


How does moissanite differ from diamonds in terms of testing?
Moissanite has different thermal and electrical conductivities than diamond, which affects its response to traditional diamond testers.

Is Moissanite easy to identify in jewelry?
With the right testing equipment, moissanite can be distinguished from diamonds. However, to the untrained eye, it may be difficult to tell the difference due to their similar appearance.

Is there a tester that can tell the difference between moissanite and diamond?
Yes, advanced diamond testers that measure thermal and electrical conductivity can accurately differentiate between moissanite and diamonds.

How reliable is a diamond tester for identifying moissanite?
The new diamond tester with dual conductivity testing is extremely reliable in identifying moissanite. However, older models based solely on thermal conductivity may not be as accurate.

Can moissanite be a sustainable alternative to diamonds?
Yes, moissanite is considered a more sustainable and ethical alternative.

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