What Is a Diamond Tester?
A diamond tester is a compact, handheld tool that determines whether a gemstone is a real diamond. It works by measuring:- Thermal conductivity — how quickly heat moves through the stone
- Some advanced models also measure electrical conductivity
Why This Matters:
Diamonds are excellent heat conductors. When a diamond tester detects this, it registers the stone as a diamond. And because lab grown diamonds conduct heat just like mined ones, they pass standard diamond testers with no issue.So, Do Lab Diamonds Pass?
Yes—because lab diamonds are real diamonds. Grown in advanced laboratories using carbon (the same element that forms diamonds naturally in the earth), lab grown diamonds:- Conduct heat like mined diamonds
- Pass both thermal and electrical conductivity tests
- Appear identical under most standard gemological tools
Can a Tester Tell if It’s Lab Grown?
Here’s where it gets more nuanced:- Standard diamond testers cannot tell the difference between lab grown and natural diamonds.
- They only detect if a stone is a diamond—not where it came from.
Why Certification Matters
Since a diamond tester can’t tell lab from natural, a grading report from a reputable gemological lab is essential.That’s why Gold Connection Jewelers only carries certified lab grown diamonds with full documentation from trusted institutions. Certification provides:- Verified origin (lab grown or mined)
- Detailed grading for cut, color, clarity, and carat
- Peace of mind with every purchase
What About Moissanite, CZ, or Simulants?
Simulants are stones that resemble diamonds but aren’t diamonds. Here’s how they perform on diamond testers: These stones do not have the same thermal conductivity as real diamonds and usually fail traditional diamond testers. Lab grown diamonds = real diamonds. Simulants = not real diamonds. Knowing the difference helps you shop with confidence—and avoid buying something that only looks like a diamond.Why Diamond Testing Is Only Part of the Picture
Diamond testers are helpful tools, but they don’t tell the full story. When buying a lab grown diamond, you should also rely on:- Certification from a gemological lab
- Professional verification from your jeweler
- Clear grading documentation for carat, cut, color, and clarity
FAQs: Quick Clarity for Curious Shoppers
Do Lab Grown Diamonds Register as Real? Yes. Lab grown diamonds will show up as real on most standard diamond testers. Can I Tell If a Diamond Is Lab Grown at Home? No, not reliably. Even professional jewelers need advanced equipment or certification to determine origin. Are There Testers That Can Detect Lab vs. Natural? Yes, but only specialized machines used in gem labs—not typical handheld testers found in stores or at home. Why Might My Diamond Not Pass the Test? If the stone is dirty, damaged, or the tester isn’t calibrated correctly, it could yield a false result. Also, simulants like CZ or moissanite may confuse older testers.Final Thought: Yes, Lab Diamonds Pass the Test
In every meaningful way, lab diamonds pass the test. They’re real diamonds—chemically, physically, and visually. They shine, sparkle, and last just like mined diamonds. And when you shop at a trusted local jeweler like Gold Connection Jewelers, you get expert support, clear documentation, and full transparency from start to finish.Our Diamond Expertise, Your Peace of Mind
As a family-owned, community-first jeweler, Gold Connection Jewelers takes pride in helping you feel confident with your purchase—whether it’s a mined or lab grown diamond. You can count on us for:- Certified lab grown diamonds with full gemological documentation
- Expert, one-on-one guidance for diamond purchases
- In-house jewelry services, including testing, repair, and custom design