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Quick answer: Yes. Lab grown diamonds pass standard diamond testers because they are real diamonds, with the same carbon structure and heat conductivity as mined diamonds. A regular jeweler's tester will read a lab grown diamond as "diamond." It cannot tell you whether the diamond was grown or mined; that takes specialized lab equipment.
If you just bought a lab grown diamond, or you are planning to, here is exactly what a diamond tester measures and what it can and cannot tell you.
How Does a Diamond Tester Work?
Thermal testers
The most common handheld tester touches the stone with a heated tip and measures how fast heat moves away. Diamond conducts heat extremely well, far better than glass or cubic zirconia. A lab grown diamond conducts heat just like a mined one, so it passes.
Electrical conductivity testers
Moissanite also conducts heat well and can fool a thermal-only tester. Many jewelers therefore use a multi-tester that also checks electrical conductivity. Most diamonds do not conduct electricity, while moissanite does, which helps separate the two.
Test Results at a Glance
| Stone | Thermal tester | Multi-tester |
|---|---|---|
| Lab grown diamond | Diamond | Diamond (see note on blue stones below) |
| Mined diamond | Diamond | Diamond |
| Moissanite | Often reads as diamond | Moissanite |
| Cubic zirconia | Not diamond | Not diamond |
One Exception to Know About
Some blue diamonds, whether lab grown or natural, contain boron, which makes them conduct electricity. On certain electrical testers, a boron-bearing blue diamond can be misread as moissanite. This is a limitation of the tester, not a problem with the diamond. A grading lab can confirm the stone with proper equipment.
Can a Tester Tell Lab Grown From Mined?
A standard jeweler's tester cannot. Separating lab grown from mined diamonds requires advanced instruments that study growth patterns, fluorescence and trace elements. Some specialized screening devices are designed for this, but the most reliable answer comes from an independent grading lab such as IGI. Its report states that the stone is laboratory grown, and many stones carry a laser inscription on the girdle that matches the report number.
Shown: 1.99 Ct Rose Cut Lab Grown Diamond, E Color, VVS1, IGI Certified
Why This Matters When You Buy
- A "diamond" reading is not proof of origin. Both lab grown and mined diamonds pass, so rely on the certificate for origin.
- Disclosure is required. In the US, the Federal Trade Commission's Jewelry Guides require sellers to clearly disclose when a diamond is laboratory grown.
- Check the report number. Match the listing, the certificate and the girdle inscription.
How We Verify Every Stone at Ivevar
Every certified lab grown diamond we sell comes with its IGI report, and we share it before you buy so you can verify the number online. We handcraft each setting in our Surat workshop and ship worldwide with free shipping and 30-day easy returns. Browse certified loose lab grown diamonds or our rose cut lab grown diamonds.
Shop Certified Lab Grown Diamonds
1.99 Ct Rose Cut, E, VVS1Shop Now
1.90 Ct Rose Cut, E, VVS2Shop Now
1.57 Ct Rose Cut, F, VVS2Shop Now
0.87 Ct Heart, Bluish GreenShop Now
1.01 Ct Heart, Greenish BlueShop Now
1.27 Ct Heart, Pinkish OrangeShop Now
Swipe to see more → | View all loose lab grown diamonds
Frequently Asked Questions
Will a pawn shop know my diamond is lab grown?
Not with a basic tester. Many shops look for a laser inscription or ask for the certificate, and some have advanced screening devices.
Does moissanite pass a diamond tester?
It often passes a thermal-only tester, but a multi-tester that checks electrical conductivity usually identifies it as moissanite.
Is a lab grown diamond a fake diamond?
No. It is a real diamond with the same chemical and physical properties as a mined diamond. Only its origin is different.
Can I test my diamond at home?
Home tests like the fog test are not reliable. For certainty, check the IGI report number online or visit a qualified jeweler.
The Bottom Line
Lab grown diamonds pass diamond testers because they are diamonds. To confirm that a stone is lab grown, and its exact grades, rely on the independent grading report and the matching girdle inscription.
Related Guides
- Are lab grown diamonds real? The facts explained
- Lab grown diamond vs moissanite
- How to buy a lab grown diamond: a simple buying guide
Author Bio
Aumsri Pradhan
Founder, Ivevar Luxury
Aumsri Pradhan is the founder of Ivevar Luxury, a Surat-based fine jewelry brand that designs and handcrafts lab grown diamond and moissanite jewelry in its own workshop. She leads the brand's design and customer experience, from engagement rings and bridal sets to custom pieces made to each client's story. Through the Ivevar blog, she shares practical guidance on lab grown diamonds, moissanite, diamond grading and ring design to help buyers choose with confidence.
