Do Lab Diamonds Pass a Diamond Tester?

If you're considering a lab-grown diamond, you might wonder whether it will pass a diamond tester. Since lab diamonds are chemically, physically, and optically identical to mined diamonds, they pass most diamond testers without issue. However, some advanced testing methods can distinguish between lab-created and natural diamonds.

At Greis Jewelers, we prioritize transparency and education, ensuring our customers make informed decisions about their diamond purchases. Let’s explore how diamond testers work, whether they can detect lab-grown diamonds, and what factors to consider when buying a lab-created diamond.

How Do Diamond Testers Work?

A diamond tester is a handheld device that helps jewelers and gemologists identify diamonds by measuring their thermal and electrical conductivity.

1. Thermal Conductivity Testing

  • Diamonds conduct heat exceptionally well, which is why traditional diamond testers rely on thermal conductivity to distinguish diamonds from other gemstones.

  • Lab-grown diamonds have the same heat conductivity as natural diamonds, meaning they will pass this type of diamond tester.

2. Electrical Conductivity Testing

  • Advanced testers measure electrical conductivity, which can help differentiate diamonds from moissanite, another highly refractive gemstone.

  • Both natural and lab diamonds share the same electrical conductivity, so they will pass this test as well.

The bottom line? Most diamond testers cannot tell the difference between a natural and a lab-created diamond.

Do Lab Diamonds Always Pass a Diamond Tester?

Yes, lab diamonds pass most commercial diamond testers, including thermal and electrical conductivity devices. However, sophisticated lab testing can distinguish them.

  • Basic Diamond Testers (Thermal Conductivity): Pass

  • Electrical Conductivity Testers: Pass

  • UV Fluorescence & Spectroscopy: Can reveal lab-grown diamonds

  • Professional Gemological Lab Testing: Can determine a diamond’s origin

Advanced Lab Testing

While most retail diamond testers won’t differentiate between lab and natural diamonds, gemological labs use specialized equipment such as:

  • UV Fluorescence Analysis – Many lab diamonds exhibit stronger fluorescence than natural diamonds.

  • Spectroscopy Testing – Identifies unique growth structures found in lab-grown diamonds.

  • Phosphorescence Testing – Measures how a diamond glows after exposure to UV light, which can differ in lab-created stones.

If you want a 100% accurate identification, choose a GIA or IGI-certified diamond with a grading report confirming whether it is lab-grown or natural.

How to Verify a Lab Diamond Beyond a Diamond Tester

Since lab diamonds and natural diamonds share the same fundamental properties, jewelers and buyers should use additional methods to verify a diamond’s origin.

1. Check for Laser Inscriptions

  • Many lab-grown diamonds have a laser inscription on the girdle indicating their origin.

  • Look for GIA, IGI, or GCAL markings along with a certification number.

2. Request a Diamond Certification

Always choose GIA or IGI-certified diamonds, which provide details on whether a diamond is natural or lab-grown.

3. Look for Unique Growth Structures

Lab-grown diamonds can exhibit growth patterns or metallic inclusions visible under high magnification.

At Greis Jewelers, we offer only certified lab and natural diamonds, ensuring transparency and peace of mind.

Why Choose a Lab Diamond?

Lab diamonds are an excellent choice for those seeking beauty, brilliance, and affordability. They are chemically identical to natural diamonds but often cost 30-40% less, allowing buyers to invest in a larger stone or a more intricate setting.

  • Same beauty and durability as natural diamonds

  • Pass all standard diamond testers

  • Certified and graded like natural diamonds

  • Ideal for engagement rings, wedding bands, and custom jewelry

Looking for a certified lab diamond engagement ring? Explore our curated selection at Greis Jewelers!

FAQs About Lab Diamonds and Diamond Testers

1. Will a diamond tester show a lab diamond as real?

Yes! Lab diamonds pass most thermal and electrical conductivity testers, just like natural diamonds.

2. Can jewelers tell if a diamond is lab-grown?

Not with a basic diamond tester. Jewelers need advanced lab equipment or certifications to confirm origin.

3. How can I ensure my diamond is real and not a simulant?

Purchase from a trusted jeweler like Greis Jewelers, and choose a GIA or IGI-certified diamond for complete authenticity.

Find Your Perfect Diamond at Greis Jewelers

Whether you prefer natural or lab-grown diamonds, we offer certified, high-quality diamonds backed by decades of expertise and excellence.

Discover the elegance and brilliance of lab and natural diamonds at Greis Jewelers.

 

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