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How to Spot Fake Lab Grown Diamonds: 7 Expert Tips Every Buyer Should Know
The rise of lab grown diamonds has transformed modern jewellery, offering a smarter, more sustainable alternative to mined diamonds. However, as demand increases, concerns about fake lab grown diamonds and misleading diamond scams are also growing rapidly. Today’s buyers want luxury that feels ethical, transparent, and authentic – making it more important than ever to understand how to identify genuine lab grown diamonds before making a purchase.
If you’ve ever wondered “Are lab grown diamonds real?” or “How do I identify a fake lab grown diamond?”, this guide will help you shop with confidence.
At Rossia Jewels, we believe informed buyers make better jewellery decisions. Here’s how to spot fake lab grown diamonds like an expert.
What Are Lab Grown Diamonds?
Lab grown diamonds are real diamonds created using advanced technology that replicates the natural diamond-growing process. They are chemically, physically, and optically identical to mined diamonds.
Unlike imitation stones, authentic lab grown diamonds possess the same brilliance, hardness, and durability as natural diamonds. Understanding this distinction is essential because many buyers mistakenly confuse real lab diamonds with fake lab grown diamonds.
They are also:
- Ethically created
- Conflict-free
- More sustainable
- Better value for money
This is why lab grown diamonds have become a preferred choice for engagement rings, fine jewellery, and everyday luxury.
You can also read:
Are Lab Grown Diamonds Fake?
No – lab grown diamonds are not fake.
A real lab grown diamond has the same carbon crystal structure as a mined diamond. The confusion often comes from imitation stones or fake lab grown diamonds being marketed deceptively as genuine diamonds.
Common fake alternatives include:
- Cubic Zirconia (CZ)
- Moissanite
- Glass or synthetic crystal stones
While these may visually resemble diamonds, they lack the durability, brilliance, and intrinsic properties of genuine diamonds.
Understanding this difference is the first step toward avoiding diamond fraud.
Common Types of Diamond Scams
As awareness of lab-grown diamonds increases, so do unethical sales practices. Here are some of the most common scams buyers should watch out for.
Simulants Sold as Lab Grown Diamonds
Some sellers market cubic zirconia or moissanite as genuine lab grown diamonds. While these stones may look similar at first glance, they are significantly less valuable and do not offer the same durability or brilliance.
Fake Diamond Certificates
Fraudulent sellers may provide vague or counterfeit certification documents to make imitation stones appear authentic. Always verify certification from recognised gemological institutes.
Low-Quality Diamonds Sold at Premium Prices
Certain sellers misrepresent poor-quality lab grown diamonds as premium-grade stones. Buyers unaware of the 4Cs often end up overpaying for diamonds with visible flaws, poor cut quality, or weak brilliance.
Unrealistic Pricing
If a diamond price feels unusually low compared to market standards, it may indicate a fake or heavily compromised stone.
7 Secret Tips to Spot Fake Lab Grown Diamonds
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Always Ask for a Diamond Certification
One of the easiest ways to verify authenticity is through certification.
A genuine lab grown diamond should come with grading from recognised institutes such as:
These certificates confirm:
- Whether the diamond is lab grown
- The diamond’s cut, colour, clarity, and carat weight
- Growth method (HPHT or CVD)
If a seller avoids showing certification, consider it a major red flag.
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Check the Sparkle Carefully
Real diamonds reflect light differently from fake stones.
Authentic lab grown diamonds display:
- Sharp white light reflection
- Balanced rainbow sparkle
- Natural brilliance under different lighting
Fake stones often appear:
- Too glassy
- Overly rainbow-like
- Dull under natural light
The sparkle test isn’t always perfect, but experienced jewellers can usually spot the difference instantly.
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Use the Fog Test
A quick at-home method is the fog test.
Simply:
- Hold the diamond close to your mouth
- Breathe warm air onto it
- Observe how long the fog remains
Real diamonds disperse heat rapidly, so the fog disappears almost immediately.
Fake stones tend to retain condensation for longer.
While not a professional verification method, it’s a useful preliminary check.
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Examine the Diamond Under Magnification
Using a jeweller’s loupe or magnifier can reveal important details.
Real lab grown diamonds may show:
- Tiny inclusions
- Subtle growth patterns
- Natural imperfections
Fake diamonds often look:
- Artificially flawless
- Too smooth internally
- Uniform in appearance
Ironically, a perfectly “perfect” stone can sometimes indicate an imitation.
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Test Thermal Conductivity
Diamonds conduct heat exceptionally well.
Professional jewellers use thermal conductivity testers to quickly identify genuine diamonds. These tools can differentiate between:
- Real diamonds
- Cubic zirconia
- Other imitation stones
This is one of the most reliable methods for spotting fake lab grown diamonds.
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Observe UV Light Reaction
Under UV light, some lab grown diamonds display unique fluorescence patterns depending on how they were created.
For example:
- Certain CVD diamonds may fluoresce differently
- Some fake stones show no reaction at all
While UV testing alone cannot confirm authenticity, it adds another useful layer of verification.
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Buy Only From Trusted Jewellers
The safest way to avoid fake lab grown diamonds is to purchase from reputable jewellery brands.
Trusted jewellers provide:
- Certified diamonds
- Transparent pricing
- Detailed product information
- Return and exchange policies
- Authenticity guarantees
At Rossia Jewels, every diamond is carefully selected, certified, and crafted to meet the highest standards of quality and transparency.
How to Protect Yourself from Diamond Frauds
Do Your Research
Understand the basics of diamond quality, including cut, colour, clarity, and carat weight.
Buy Only from Reputable Brands
Choose jewellers known for transparency, certifications, and customer trust.
Ask Questions
A genuine seller will always explain a diamond’s origin, certification, and quality details clearly.
Seek Expert Verification
For high-value purchases, consider consulting an independent gemologist for additional peace of mind.
Use Secure Payment Methods
Avoid risky payment methods and choose secure transactions that offer buyer protection.
Why More Buyers Choose Certified Lab Grown Diamonds
Modern consumers want more than beauty – they want transparency and value.
Lab grown diamonds offer:
- Exceptional brilliance
- Better affordability
- Ethical sourcing
- Sustainable luxury
- Certified quality
That’s why they continue to redefine the future of fine jewellery.
Explore timeless, certified lab grown diamond rings at Rossia Jewels.
Final Thoughts
Knowing how to identify fake lab grown diamonds helps you shop with confidence and avoid costly mistakes. From certifications and sparkle tests to thermal testing and trusted sellers, these expert tips can help you distinguish genuine diamonds from imitations.
Whether you’re buying an engagement ring, pendant, or everyday jewellery, always prioritise authenticity, transparency, and certification.
Because real luxury should never come with uncertainty.
Frequently Asked Questions (FAQs)
Answer: Lab grown diamonds are completely real diamonds. They have the same chemical and physical properties as mined diamonds.
Answer: Fake lab grown diamonds are usually imitation stones like cubic zirconia or moissanite. Certification, thermal testing, and magnification can help identify authentic diamonds.
Answer: Yes. Genuine lab grown diamonds should always come with certification from recognised gemological institutes such as IGI or GIA.
Answer: Yes. Professional jewellers use specialised equipment to identify whether a diamond is natural or lab grown.
Answer: Unfortunately, yes. This is why buyers should always verify certifications and purchase from reputable jewellers.
Answer: No. Real lab grown diamonds maintain their brilliance and durability just like natural diamonds.
Answer: Purchase from trusted jewellery brands like Rossia Jewels that provide certified diamonds, transparent pricing, and authenticity guarantees.
