IGI vs GIA Lab Grown: Which One Should You Trust for Lab Made Diamonds?

So, you’re looking at lab made diamonds—good choice! But then you stumble on the whole certification thing. And suddenly, the excitement turns into a question mark: IGI vs GIA lab grown—what’s the deal?

Let’s be honest, no one dreams about certificates when shopping for a diamond. But when it’s time to actually spend your hard-earned money, knowing who’s grading that sparkling beauty matters a lot more than you’d expect.

What’s the Big Deal About Diamond Grading Anyway?

Imagine you just found the perfect lab made diamond. It looks stunning in the light, it fits the budget, and it’s certified.

But wait—certified by who?

This is where the plot thickens. Most people don’t realize there’s a difference between grading labs. And when it comes to lab grown diamonds, two names come up a lot: IGI and GIA.

Here’s a little context.

For decades, GIA (Gemological Institute of America) has been the gold standard for grading natural diamonds. Think of them as the old-school Ivy League of gemology. Then there’s IGI (International Gemological Institute)—the younger, more adaptable cousin that was quicker to embrace the lab grown revolution.

To be fair, both are respected. But they don’t always see eye-to-eye—especially when it comes to lab made diamonds.

IGI vs GIA Lab Grown: What’s the Actual Difference?

Okay, let’s break it down in real-world terms. You’re not grading a physics paper—you just want to know if the diamond is worth it. So here’s what makes each certification different (and why it matters to you).

1. Grading Style

• GIA is known for being super conservative. Some even say a bit too strict. 
• IGI tends to be more generous, especially with color and clarity.

Let’s say you’re looking at a 1-carat lab made diamond. IGI might grade it as VS1 clarity, while GIA could say it’s VS2—or even SI1. That’s a noticeable difference on paper (and price tag).

2. Speed & Accessibility

• IGI was way ahead in grading lab grown diamonds. They jumped on it early, and today most lab grown stones on the market come with IGI certs. 
• GIA took its time. For a while, they didn’t even offer full grading for lab made diamonds. Now they do, but it’s still catching up.

3. Pricing Impact

Here’s the kicker: because GIA is more conservative, a GIA-graded lab diamond may cost more than an IGI-graded one of the “same” specs.
But—and this is important—it might actually be the same diamond, just graded differently.

So yeah… not confusing at all, right?

So, Which One Should You Go With?

It depends on your priorities. Here’s a cheat sheet:

• Want peace of mind and resale value?
  → Go with GIA. It holds more weight in the traditional diamond world. 
• Want better value and more options?
  → IGI is your friend. Especially for lab grown. 
• Buying for yourself and not planning to sell later?
  → Honestly? IGI is more than fine.

But here’s the thing: don’t just rely on the certificate. Always look at the diamond itself. Two diamonds with the same grade can look totally different in person.

Why This Matters More Than Ever—Especially Here

If you’re shopping for lab made diamonds in places like Hong Kong, Dubai, or even online marketplaces like Etsy and Brilliant Earth, chances are you’re seeing a lot more IGI stones than GIA. And there’s a reason. IGI is dominating the lab grown space. It’s not just about being faster or cheaper—it’s about meeting the demand. Retailers want consistency, speed, and availability. And IGI delivers on all three.

That said, don’t be surprised if you see GIA starting to show up more often. Especially in premium settings where buyers are a bit more label-conscious. Kind of like how some people prefer Nike over Adidas—both are great, but brand trust plays a role.

How Grading Works (Without the Boring Lecture)

Alright, you don’t need a gemology degree to understand this part. But a quick peek under the hood helps.

Step 1: Diamond Gets Sent to the Lab

The jeweler or manufacturer sends the loose diamond to either IGI or GIA. It’s unmounted—no settings or rings involved.

Step 2: Grading the 4Cs

The lab inspects:

• Cut 
• Color 
• Clarity 
• Carat weight
  

Each one is assigned a grade. But here’s where the fun begins—each lab uses slightly different methods, lighting setups, and even grading scales in some cases. So yes, the same diamond can be graded differently depending on where it’s sent.

Step 3: Report Is Issued

This is the “birth certificate” of the diamond. And for lab grown diamonds, it will clearly state that the stone is lab created. No secrets there.

Also: GIA reports for lab grown diamonds look different from their natural diamond reports. Just a heads-up.

It’s Not About Perfect—It’s About Confidence

At the end of the day, choosing between IGI vs GIA lab grown isn’t about which one is “better.” It’s about what you value. Want the most trusted name and tighter grading? Go GIA. Want the best price and widest selection? IGI has your back. Want a stress-free shopping experience? Find a seller who lets you see the diamond in person or via HD video. That tells you more than any report ever could.

Because honestly—when you’re staring at that sparkling stone, you’re not going to be thinking,
“Hmm, is this a GIA cert or IGI?” You’ll be thinking,  “Wow. That’s the one.”

Bonus Tip: If you’re shopping online, ask for the certification before you buy. And make sure the report number matches the one laser-inscribed on the diamond (yep, that’s a thing).