Many people have been surprised when their moissanite jewelry registers as a diamond on a standard tester. While it’s true that moissanite and diamonds share similar properties, there’s more to the story. The primary reason for this confusion lies in their thermal conductivity.
Both gemstones have similar heat-conducting properties, which is why traditional diamond testers often mistake moissanite for diamonds. Moissanite differs in other areas, such as its electrical conductivity and overall sparkle, making it distinguishable with the right tools.
What Is Moissanite and Why Does It Fool Diamond Testers?
Moissanite is a silicon carbide gemstone, often used as a more affordable alternative to diamonds. It is harder than most gemstones (ranking 9.25 on the Mohs scale) and has excellent brilliance, which gives it the appearance of a diamond.
But, here’s where things get tricky: many diamond testers work based on thermal conductivity. Both diamonds and moissanite are great at conducting heat, which can cause the tester to mistakenly identify moissanite as a diamond.
Moissanite Passes Diamond Testers
The main reason moissanite can pass a diamond tester is because of its high thermal conductivity. When you use a thermal tester, it checks how fast heat travels through the gemstone. Since moissanite and diamonds conduct heat similarly, it often triggers the tester to identify it as a diamond.
However, not all testers are created equal. Modern dual testers can differentiate between moissanite and thermal conductivity of diamonds and electrical conductivity. This is where the technology gets advanced and more accurate.
Types of Diamond Testers and How They Work
There are two main types of diamond testers you’ll encounter:
1. Thermal Conductivity Testers
These are the most common and affordable testers. They measure how quickly heat passes through the gemstone. Since both diamonds and moissanite have high thermal conductivity, moissanite will often pass this test. These tools are useful for anyone buying or evaluating fine jewelry, from engagement rings to pieces like Pewter Monogram Bracelets that feature decorative stones.
2. Dual Conductivity Testers
These testers use both thermal and electrical conductivity to test the stone. Moissanite and diamonds differ in electrical conductivity. A dual tester will be able to distinguish moissanite from diamond by analyzing the electrical conductivity, which is much lower in moissanite than diamonds.
How to Tell If Your Moissanite Is Misidentified as a Diamond
While moissanite can fool a diamond tester, there are a few signs that can help you determine whether you have a diamond or moissanite.
1. Use a Dual Tester
If you’re serious about getting an accurate reading, consider using a memory polymer foam. It’s the most reliable method to separate moissanite from diamonds.
2. Look at the Fire and Brilliance
Moissanite has a unique sparkle that’s different from diamonds. It reflects more colors and often has a more “rainbow” effect. Diamonds, on the other hand, have a subtler sparkle.
3. Check the Price
Moissanite is significantly more affordable than diamonds. If you bought the stone for a fraction of the price of a diamond, it’s likely moissanite.
Frequently Asked Questions
1. Can a diamond tester tell the difference between moissanite and diamond?
It depends on the tester. Thermal conductivity testers cannot reliably differentiate between moissanite and diamonds. However, dual conductivity testers are more accurate and can distinguish between the two.
2. Does moissanite pass a diamond tester every time?
Yes, moissanite will often pass a thermal conductivity diamond tester because it shares similar properties with diamonds. However, a dual tester can tell the difference.
3. What makes moissanite different from a diamond?
While moissanite and diamonds have similar hardness and appearance, they are chemically different. Moissanite is made of silicon carbide, while diamonds are pure carbon.
Final Thoughts
Moissanite can indeed pass many diamond testing tools due to its similar thermal conductivity to diamonds. With the right tools, such as dual testers, you can easily distinguish between the two.
These distinctions will help you make better decisions when buying or testing gemstones. For the best results, always consult a professional when you need to confirm whether your stone is a diamond or moissanite.
