Do Lab Diamonds Pass a Diamond Tester?
When you hear the word “diamond,” you expect brilliance, durability, and timeless value — and when lab grown diamonds entered the conversation, many wondered: Can they truly stand up to a diamond tester?
If you are considering a lab diamond for your engagement ring, anniversary gift, or custom heirloom piece, it is only natural to ask: Do lab diamonds pass a diamond tester? Let us guide you through the answer with clarity, expertise, and the trust Emerson Fine Jewelry is known for.
What Is A Diamond Tester?
A diamond tester is a handheld tool that measures how well a gemstone conducts heat or electricity. Natural diamonds have high thermal conductivity — that unique property helps distinguish them from look-alikes like cubic zirconia or moissanite.
Do Lab Diamonds Have The Same Properties?
Yes. Lab grown diamonds are real diamonds in every scientific sense — they share the exact same crystal structure, optical qualities, and thermal conductivity as mined diamonds.
The only true difference is where they originate: above the earth instead of deep below it. When you place a lab diamond under a diamond tester, it behaves exactly like its natural counterpart.
So, Will A Lab Diamond Pass A Tester?
Yes.
A lab grown diamond will pass a thermal conductivity diamond tester because it is chemically and physically identical to a mined diamond.
Some modern testers also measure electrical conductivity to help identify moissanite, which can sometimes fool thermal-only testers. Lab diamonds do not conduct electricity like moissanite does — so they remain consistent in standard diamond testing.
Lab Diamond vs. Simulant: A Key Distinction
It is worth highlighting this point: lab diamonds are not simulants.
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Lab Diamonds: Grown carbon crystals, same structure as natural diamonds.
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Simulants: Stones like cubic zirconia or moissanite that look like diamonds but are entirely different minerals.
Simulants will often fail a diamond tester because they lack the thermal conductivity that only real diamonds — mined or lab grown — possess.
Real Diamond vs. Simulant Comparison
This illustrates why lab diamonds are authentic diamonds — indistinguishable in testing and performance.
Why Does This Matter For You?
When you invest in a lab diamond from Emerson Fine Jewelry, you gain peace of mind knowing that what you hold is a true diamond — worthy of the same care, setting, and significance as any mined stone.
Your lab grown diamond can be certified by leading gemological labs, set in heirloom-quality rings, and passed down for generations.
Do Diamond Testers Ever Make Mistakes?
While today’s testers are reliable, a stone’s mounting, size, or extreme temperatures can sometimes affect a reading. That is why we always pair advanced instruments with the trained eye of our expert gemologists.
Every diamond we offer — mined or lab grown — is vetted with professional precision and a commitment to your confidence.
How Emerson Fine Jewelry Ensures Authenticity
Every lab grown diamond in our curated selection is graded and certified by reputable institutions. We believe transparency, trust, and quality are not optional — they are the standard you deserve.
When you choose a lab diamond with us, you gain access to master jewelers, refined design guidance, and a custom process that turns your vision into an heirloom-worthy reality.
Key Takeaway: Lab Diamonds Are Real Diamonds
If you have asked “Do lab diamonds pass a diamond tester?” — the answer is clear: Yes, they do. They shine, test, and endure just as beautifully as natural diamonds.
Emerson Fine Jewelry: Trust, Quality, and Diligence
Whether you choose a lab grown diamond or a natural mined diamond, our promise remains the same: you will receive an extraordinary gem, hand-selected, beautifully set, and supported by our commitment to craftsmanship and care.
If you can dream it, we can design it!
Explore our custom design process or discover our curated lab diamond collections.