GIA’s New Lab Diamond Report: What It Means and What It Doesn’t Tell You

Under the revised system, you can expect:

• No more exact color grades for lab-grown diamonds (like G, F, or E).

• No more precise clarity grades (like VS1 or SI2).

• Each lab-grown diamond will be labeled Premium or Standard after being evaluated for color, clarity, and cut as a whole.

• Diamonds that fall below “Standard” won’t receive any report from GIA.

• Lab-grown diamonds will still be laser-inscribed with “Laboratory-Grown” and their GIA assessment number.

The goal, according to GIA, is to create terminology that reflects the nature of lab-grown diamonds rather than applying grading systems originally designed for natural diamonds.

On the surface, that sounds reasonable since lab diamonds aren’t mined, and many share very similar quality ranges. But removing traditional grading removes something else too: granularity, the nuance that helps consumers compare stones and understand value.

GIA has publicly stated that the shift is meant to:

• Reduce confusion between natural diamonds and lab-grown stones

• Simplify quality interpretation within a category where most diamonds fall within similar grade bands

• Reflect the fact that D–Z grading was created for natural geological variation that lab diamonds don’t necessarily share

There’s also a broader industry conversation underway: Should natural and lab-grown diamonds be described in the same language? Or should each category have its own vocabulary? GIA appears to be leaning toward the latter.

When taken at face value, the new system from GIA could have some potential benefits for buyers:

1. It can feel simpler at a glance.

If all you want is assurance that a diamond looks bright and clean to the eye, a Premium label could be enough for many buyers.

2. GIA is still verifying identity.

Even without D or VS1 labels, GIA will still confirm the stone’s origin and inscribe it, which is an important safeguard against misrepresentation.

3. It reduces the false equivalence between natural and lab grading.

A D-color natural diamond with VVS clarity is not priced or valued the same way as a “D/VVS” lab diamond, even if the numbers look identical. The new system attempts to address that long-standing confusion.

For consumers who do care about detail, and for anyone making a significant purchase, there are real drawbacks to this change.

1. Loss of transparency

With no precise grade, two “Premium” stones might differ notably in color, clarity, or cut, but the report will no longer show how or why.

2. Harder to price compare

A GIA Standard stone from one retailer might be equivalent to another retailer’s IGI E VVS1, but consumers can no longer line those up side by side.

3. Less power for the buyer

When information disappears, the buyer loses the power of knowledge, putting much more pressure on you to trust the seller implicitly.

4. It opens the door to inconsistent standards

Retailers now have more flexibility in describing a stone’s specifics, but that flexibility can become a liability if not used with full honesty and clarity.

“I’m not yet convinced this new reporting structure by GIA ultimately benefits buyers,” shares Ken Leung, founder Ken & Dana Design. “Customers want clear, exact information. They want to compare apples to apples. Taking away familiar grading systems doesn’t simplify, it obscures.”

Even if GIA isn’t listing full details anymore, the most important thing hasn’t changed: you should lean on a trusted jeweler to help you interpret what a report can and cannot tell you—and to guide you through what truly matters when choosing a diamond.

Buying a diamond has never been as simple as comparing color and clarity grades. As Ken Leung notes, “Even under the current system, two natural diamonds with the exact same grades can trade at totally different price points because of factors you’ll never see on a report, like brilliance or the bow-tie effect. Ultimately, the ‘look’ determines the last 10–15% of a diamond’s price, and that’s the critical part the report doesn’t capture.”

So rather than focusing on lost grading categories, here’s what matters now:

1. A clear explanation of the diamond’s quality

A trusted jeweler can walk you through the stone’s approximate color, clarity, cut quality, and any relevant lab findings, helping you understand how it stacks up—even without a traditional grade on paper.

2. Context on proportions and performance

Instead of getting lost in numbers, rely on your jeweler to explain how a diamond’s proportions translate into real-world brilliance, light performance, and visual appeal.

3. Seeing the diamond for yourself

High-quality photos, videos, and in-person viewing matter more than ever. The nuances of sparkle, fire, and personality don’t show up in any grading system: Premium, Standard, or otherwise.

4. Understanding visual effects

Your jeweler can help you evaluate the stone’s behavior in various lighting environments, something that has always been a complex element of a diamond to define on a report.

5. Guidance on value and pricing

Because reports now reveal less, your jeweler becomes your partner in understanding why one diamond costs more than another and whether the difference is visible or meaningful to you.

“Premium or Standard might be where GIA stops, but it’s not where we stop,” Ken explains. “We’ll continue helping clients interpret what’s on the report, what’s not on the report, and most importantly, what their eyes are actually seeing. That’s how you choose the right diamond.”

GIA has reversed policy on lab diamonds before, and the industry wouldn’t be surprised to see them adjust again.

“If this rollout creates confusion or undermines trust, GIA may shift back to more detailed grading,” Ken predicts. “Though I suspect that IGI (International Gemological Institute) will grow as the trusted source for grading and certification of lab-grown diamonds.”

Whether this change lasts, gets reworked, or IGI continues to expand their lab-diamond grading, the takeaway for now is simple: the value of your diamond isn’t determined by a two-word label. It’s determined by the details your jeweler shows you.

The new GIA report for lab-grown diamonds is a big shift, and while it aims to simplify the buying experience, it removes some of the most familiar tools consumers have always used to compare stones confidently. But this is where a transparent, client-first jeweler makes all the difference. GIA’s new categories may tell part of the story, but your jeweler should tell the rest.