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Quick answer: You cannot tell a lab grown diamond from a mined diamond by looking at it, even with a jeweler's loupe. The reliable ways to know are: read the grading report, look for the laser inscription on the girdle, and, when there is no paperwork, have the stone tested by a gemological lab with specialized equipment.
Whether you inherited a ring, bought a stone secondhand, or simply want to confirm what you own, this guide walks through each method from easiest to most definitive.
1. Check the Grading Report
The easiest way to know is the certificate. Independent labs such as IGI clearly state when a diamond is laboratory grown, often on the front of the report and sometimes in a different report color or format. The report will also list the growth method, CVD or HPHT, and any post-growth treatment.
Look up the report number on the lab's website to confirm it is genuine and matches the stone's carat weight and measurements.
2. Look for the Laser Inscription
Most certified lab grown diamonds have a microscopic laser inscription on the girdle, the thin outer edge. It usually includes the report number and often the words "LAB GROWN" or "LG." You will need a 10x loupe and good light, and a jeweler can find it for you in seconds.
3. Ask a Jeweler to Screen It
Many jewelers now own screening devices that flag stones as possibly lab grown. These tools are useful, but screening is not the same as identification. A stone that gets flagged should be sent to a lab for a final answer.
4. Send It to a Gemological Lab
For a definite answer, a lab such as IGI or GIA examines the diamond with advanced tools, including spectroscopy and fluorescence imaging, which reveal growth patterns that differ between lab grown and mined diamonds. This is the only fully reliable method when there is no report or inscription.
Methods Compared
| Method | Reliable? | Cost and effort |
|---|---|---|
| Looking with the naked eye | No | Free, but tells you nothing |
| Standard diamond tester | No, both read as diamond | Free at most jewelers |
| Grading report | Yes, if verified online | Free if you have it |
| Girdle laser inscription | Yes, with a matching report | Free with a loupe or jeweler |
| Jeweler screening device | Good first check | Low |
| Gemological lab test | Yes, the most definitive | A lab fee and some waiting time |
Shown: 2.00 Ct Heart Cut Fancy Vivid Blue Lab Grown Diamond, VVS2, IGI Certified
Myths That Do Not Work
- "Lab diamonds are too perfect." Lab grown diamonds can have inclusions, just like mined ones. Flawless appearance proves nothing.
- "The fog test." Breathing on a stone may separate diamond from glass, but lab and mined diamonds behave the same.
- "Lab diamonds sparkle differently." Sparkle comes from cut quality, not origin.
- "A diamond tester can tell." Standard testers read both as diamond.
What US Law Says About Disclosure
Under the Federal Trade Commission's Jewelry Guides, sellers in the US must clearly disclose when a diamond is laboratory grown, using terms like "laboratory-grown," "laboratory-created" or "[manufacturer name]-created." If a seller calls a lab diamond "natural," that is misleading. Always ask for the report in writing.
Buying With Confidence at Ivevar
We clearly label every lab grown diamond and share the IGI report for certified stones before you buy. Each piece is handcrafted in our own Surat workshop and ships worldwide with free shipping and 30-day easy returns. Browse our certified loose lab grown diamonds or heart shaped lab grown diamonds.
Shop Heart Shaped Lab Grown Diamonds
2.00 Ct Heart, Vivid BlueShop Now
3.29 Ct Heart, Intense BlueShop Now
2.03 Ct Heart, Vivid GreenShop Now
2.08 Ct Heart, Green BlueShop Now
3.15 Ct Heart, Light PinkShop Now
4.07 Ct Heart, Brownish PinkShop Now
Swipe to see more → | View all loose lab grown diamonds
Frequently Asked Questions
Can a jeweler tell if a diamond is lab grown just by looking?
No. Even experienced jewelers need a report, an inscription or specialized equipment.
Is it bad if my diamond turns out to be lab grown?
Not at all. It is still a real diamond with the same beauty and durability. It simply has lower resale value than a mined diamond.
Can the laser inscription be removed?
It can be polished off, which is why a stone without an inscription or report should be tested by a lab before you pay a mined-diamond price.
How long does lab testing take?
It varies by lab and service. Ask the lab for current turnaround times before you send the stone.
The Bottom Line
You cannot tell lab grown from mined by eye or with a basic tester. Rely on a verified grading report, a matching girdle inscription, or a gemological lab test, and always buy from a seller who discloses origin clearly.
Related Guides
- Are lab grown diamonds real? The facts explained
- Difference between lab and natural diamonds
- All about heart shaped diamonds
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.
