How to check diamond purity in 7 easy steps!

Buying a diamond is special. But it can also feel confusing.

Many people today choose lab grown diamonds. They look the same as natural diamonds. They cost less. And they are eco-friendly.

But one question still matters:
How do you check whether a lab-grown diamond is pure and real?

This guide will help you. You will learn simple steps to check purity without stress.

Looking for certified diamonds you can trust?
Explore the top lab grown diamond jewellery in Chennai, Djwl with premium quality, IGI-certified pieces, and transparent pricing
👉 Book a free consultation today.

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What is a Lab Grown Diamond?

A lab grown diamond is made in a lab using advanced technology. It has the same:

• Hardness
• Sparkle
• Structure

as a natural diamond.

Even experts need tools to tell the difference.

That’s why checking purity is important.

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Why Checking Purity Matters

Before we go to the steps, let’s understand why this matters.

• You avoid fake stones
• You get the right value
• You ensure long-term durability
• You make a smart investment

If you are buying from the top lab grown diamond jewellery in Chennai, these checks become even easier.

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Step 1: Check the Certification

This is the most important step.

A real lab grown diamond must have a certificate from trusted labs like:

• IGI (International Gemological Institute)
• GIA (Gemological Institute of America)

What to Look For:

• Diamond type (lab grown)
• Carat weight
• Color grade
• Clarity grade

If there is no certificate, do not buy.

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Step 2: Look for Laser Inscription

Most certified diamonds have a tiny code on them.

This code is:

• Laser engraved
• Matches the certificate

How to Check:

Use a magnifying glass or jeweler’s loupe.

If the number matches the certificate, your diamond is genuine.

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Step 3: Examine Clarity

Clarity means how clean the diamond is.

Even lab diamonds can have tiny marks.

What to Check:

• Fewer inclusions = higher purity
• Eye-clean diamonds are best

Tip:

Ask the seller to show the diamond under magnification.

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Step 4: Test the Sparkle (Brilliance)

Diamonds shine uniquely.

Lab grown diamonds reflect light in three ways:

• White light (brightness)
• Rainbow light (fire)
• Sparkle (scintillation)

Simple Test:

Hold the diamond under the light.

If it sparkles sharply and brightly, it is a good sign.

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Step 5: Check the Cut Quality

Cut is not shape. It is how well the diamond is made.

A good cut makes the diamond shine more.

Look For:

• Even edges
• Symmetrical shape
• No dull areas

Grades:

• Excellent
• Very Good
• Good

Always choose Excellent or Very Good.

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Step 6: Use a Diamond Tester

A diamond tester checks heat or electricity flow.

Lab diamonds pass this test like natural diamonds.

Important:

• Moissanite can sometimes confuse testers
• Use advanced testers if possible

You can ask the jeweler to test it in front of you.

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Step 7: Buy from a Trusted Jeweler

This step is often ignored but very important.

A trusted seller ensures:

• Certified diamonds
• Honest pricing
• After-sale support

If you are looking for the top lab grown diamond jewellery in Chennai, always choose a brand with:

• Strong reviews
• Certifications
• Transparent pricing

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Common Mistakes to Avoid

Many buyers make simple mistakes.

Avoid these:

❌ Buying without certification

❌ Choosing only based on price

❌ Ignoring cut quality

❌ Not checking return policy

A cheap diamond is not always a good deal.

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Lab Grown vs Fake Diamonds

Let’s clear a common confusion.

Feature	Lab Grown Diamond	Fake Diamond
Material	Real carbon	Glass or cubic zirconia
Shine	High	Low
Durability	Very strong	Weak
Certification	Yes	No

Lab grown diamonds are real diamonds.

Fake ones are not.

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How to Identify High Purity Quickly

If you want a quick check, remember this:

• Certified
• Bright sparkle
• Clean look
• Trusted seller

These four signs usually mean high purity.

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Why Lab Grown Diamonds Are Popular

People love lab diamonds because:

• They cost 30–50% less
• They are eco-friendly
• They look identical to natural diamonds

This is why demand is rising, especially for the top lab grown diamond jewellery in Chennai.

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Expert Tips Before You Buy

Here are some simple tips:

1. Always compare certificates

2. Check diamonds in natural light

3. Ask for a return policy

4. Choose quality over size

A smaller, high-quality diamond looks better than a bigger, dull one.

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Best Time to Buy top lab grown diamond jewelleryLab

You can buy anytime, but these times are better:

• Festive offers
• Wedding season deals
• Store promotions

Trusted sellers often give better pricing during these periods.

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FAQs (People Also Ask)

1. How can I tell if a lab grown diamond is real?

Check certification, laser inscription, and sparkle. A certified diamond is always real.

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2. Do lab grown diamonds pass diamond testers?

Yes. They behave like natural diamonds in most tests.

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3. Are lab grown diamonds pure?

Yes. They have the same physical and chemical properties as natural diamonds.

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4. Is certification necessary for lab diamonds?

Yes. It proves authenticity and quality.

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5. Can I see flaws in a lab grown diamond?

Some diamonds have tiny inclusions. High-quality ones look clean to the eye.

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6. Where can I buy the top lab grown diamond jewellery in Chennai?

Choose a trusted jeweler with certifications, strong reviews, and transparent pricing.

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7. Are lab grown diamonds a good investment?

They are great for value and beauty, but not always for resale.

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Final Thoughts

Checking top lab grown diamond jewellery purity is not hard.

You just need the right steps:

• Verify certification
• Check sparkle and clarity
• Inspect cut quality
• Buy from a trusted seller

When you follow these steps, you can buy with confidence.

If you are searching for the top lab grown diamond jewellery in Chennai, always focus on quality, trust, and transparency. Djwl is the best amongst all

That’s how you make a smart and beautiful choice.