Lightbox Lab-Grown Diamonds: What to Know

By Alex Klimchenko · Updated November 2, 2026

Lightbox is a lab-grown diamond brand that Rapaport describes as a De Beers subsidiary. On May 12, 2024, Rapaport reported that the standard line, I to J color, would retail for $500 per carat, down from $800. Whether you are looking at Lightbox diamonds or any other lab-grown diamond, the sections below give the prices as reported, a way to compare stones by the GIA 4Cs, and where Labrilliante fits.

The figures below come from Rapaport's article "De Beers Reduces Prices of Lightbox Lab-Grown Diamonds," published May 12, 2024. They are as reported on that date and may have changed since. Check the seller for current pricing.

Rapaport described the move from $800 to $500 per carat as a reduction of 37.5%. The "$800 per carat" in this page's address is that earlier rate, not the one reported in 2024.

Prices only compare when the stones match. If a customer quotes you a price for Lightbox jewelry, or for any lab-grown diamond, the GIA 4Cs give you the terms to check it against what you sell.

• Color. GIA grades color from D to Z. According to GIA, when we talk about diamond color, we are often talking about the absence of color.
• Clarity. GIA uses 11 clarity grades, assigned under 10x magnification.
• Cut. GIA's cut grade applies to standard round brilliant diamonds. For a fancy shape such as oval or pear, ask the seller how the cut is described.
• Carat. Carat is weight, so two stones of the same carat can differ in color, clarity and cut.

GIA issues a Laboratory-Grown Diamond Report that states color and clarity. According to GIA, a laboratory-grown diamond has the same crystal structure and nearly the same properties as a mined one. What differs is origin, and a report is how you document the grades.

Not every lab-grown stone on the market has a report. Ask which laboratory issued it, whether the report number matches the stone, and what the color and clarity grades are. If a stone has no report, ask how its grades were determined. A per-carat price for a stone with a report and one for a stone without are not like-for-like.

Labrilliante is a US-based manufacturer and wholesale supplier of lab-grown diamonds (HPHT & CVD), serving jewelry retailers and brands since 2017. IGI- and GIA-certified diamonds are available, plus calibrated melee (reports on request), colored diamonds and custom cuts. We have 100,000+ loose diamonds in stock, both certified and non-certified.

Retailers and brands can read about supply on the wholesale lab-grown diamonds page. A selection of loose stones can be browsed at labrilliante.com/diamonds/lab-diamonds. Tell us the shape, size and report you need, and we will say what is available. Reach us at info@labrilliante.com or +1 551-321-8771.

Is Lightbox a lab-grown diamond brand?

Yes. Rapaport describes Lightbox as a De Beers subsidiary and reports on its lab-grown diamonds. The standard line has I to J color, according to Rapaport's May 12, 2024 article. When you compare any lab-grown diamond, the color, clarity, cut and carat details tell you more than the brand name.

Did Lightbox change its price?

Rapaport reported on May 12, 2024 that the standard line would retail for $500 per carat, compared with an earlier $800, a reduction of 37.5%. Rapaport also listed D to F color, VS clarity, excellent cut at $900 and G to H color at $600 per carat. Prices may have changed since, so confirm with the seller.

What does the "$800 per carat" in this page's address refer to?

It refers to the earlier standard-line rate Rapaport cited before the May 2024 change. The address is kept so existing links keep working. The $500 figure is the rate Rapaport reported on May 12, 2024.

How do I compare lab-grown diamonds from different sellers?

Line up the same four points: color (GIA scale D to Z), clarity (11 GIA grades, assessed at 10x), cut (graded by GIA for round brilliants) and carat weight. Then check whether each stone has a laboratory report and whether the number matches the stone. Not every lab-grown diamond has a report, so ask before you compare.