Do Lab Grown Diamonds Pass A Diamond Tester?

Ah, diamonds. These sparkling wonders have long been treasured for their unparalleled beauty and value. As both a symbol of luxury and a testament to nature’s magnificence, diamonds have etched their brilliance into the annals of history. However, recent technological advancements have led to the rise of lab-grown diamonds. Here at Vivian Jewelers, we've noticed an uptick in questions from our passionate jewelry enthusiasts: "Do these lab-crafted marvels stand up to the traditional diamond tester?" Let's delve into this captivating topic together.

Understanding Diamond Testers

Diamond testers, for the uninitiated, are nifty tools that play a pivotal role in the jewelry industry:

  • Thermal Conductivity Testers: Diamonds are champions at dispersing heat, a trait these testers bank on.
  • Electrical Conductivity Testers: While most diamonds are not known for conducting electricity, those with certain impurities can surprise you.
  • Combination Testers: A mix of the above, providing a more comprehensive testing process.

The overarching purpose? To validate the authenticity of a diamond.

The Science Behind Lab-Grown Diamonds

Lab-grown diamonds aren't mere imitations; they're genuine diamonds, crafted with precision and expertise. Their creation primarily stems from two methods:

  • High-Pressure High Temperature (HPHT): Mimicking nature’s intense underground pressures and temperatures.
  • Chemical Vapor Deposition (CVD): Growing diamonds layer by layer in a controlled chamber.

Despite their synthetic origin, these diamonds share the core characteristics of their natural counterparts.

Lab-Grown Diamonds vs. Diamond Testers

  • Thermal Conductivity: Both natural and lab-grown diamonds excel in dispersing heat, making them indistinguishable in this aspect.
  • Electrical Conductivity: Here's where things get interesting. Type IIa diamonds, which can be lab-grown, differ in conductivity from other diamonds.
  • Combination Testers: By merging the two methods, these testers offer a nuanced perspective, though they're not infallible.

Factors Affecting Test Results

  • Diamond Impurities: Elements like boron or nitrogen can skew results.
  • Tester Calibration and User Expertise: A misstep here can lead to inaccurate results.
  • False Positives or Negatives: No system is perfect. Sometimes, anomalies occur.

Other Methods of Differentiation

Beyond traditional testing, professionals often employ advanced techniques, such as spectroscopy, to discern diamonds' origins. Remember, a certification from a recognized gemological institute is your best friend when purchasing diamonds, whether they’re from Earth’s depths or a lab.

Benefits of Lab-Grown Diamonds

  • Ethical Considerations: Lab-grown diamonds circumvent the issues surrounding conflict diamonds.
  • Environmental Benefits: Lesser ecological impact than mining.
  • Cost-effectiveness: More bang for your buck without compromising quality.


Lab-grown diamonds, with their splendor and authenticity, can indeed pass traditional diamond testers. As you adorn yourself or your loved ones with these gems, rest assured of their quality. 

Whether you're browsing our Signature Collection or just seeking knowledge, Vivian Jewelers is always here to guide and assist. After all, every diamond, be it natural or lab-grown, has its unique tale to tell.