Lab-Grown Diamond Brand Lightbox Cuts Prices by 25 to 40%
The move follows a price-drop test run in Q4 and comes with the addition of a “quality assurance card” from GIA for some loose diamonds.

Lightbox tested reduced prices in the fourth quarter 2023 and announced Friday it had officially adopted price cuts across the board, with the steepest drop coming for its highest-quality goods.
It is now selling its “Finest” lab-grown diamonds—D-F color, excellent cut, and VS clarity—for $900 a carat, 10 percent lower than the price offered in the Q4 trial ($1,000 per carat), and 40 percent off the original price of $1,500 per carat.
Prices on I-J color lab-grown diamonds were cut 38 percent, from $800 to $500 a carat, while G-H color stones are going for $600 a carat, down 25 percent from $800 a carat.
Even before Lightbox announced it was making its price cuts permanent, its lab-grown diamonds were priced well below the retail average, observed industry analyst Edahn Golan, co-founder of data analytics firm Tenoris.
He said in April, the average retail price of a 1-carat lab-grown diamond was $1,093, which is 27 percent more than Lightbox was charging for its standard lab-grown diamonds (G-J color and VS clarity).
Retailers paid $364 when they purchased that diamond, giving them a 67 percent gross margin, he said.
“It looks like De Beers is continuing with its effort to pull down lab-grown diamond retail prices by offering them for far below market prices,” Golan said, while noting that even under the new pricing, Lightbox is still selling well above its costs.
“We should expect continued lab-grown diamond price declines, especially considering the large margins through most of the lab-grown diamond pipeline, and the oversupply of goods,” he concluded.
Also on Friday, Lightbox announced it would now be obtaining batch quality verification for its lab-grown diamonds through the Gemological Institute of America.
Lightbox said GIA will assess a “statistically significant” sample in each production run to ensure they meet the lab’s quality criteria for color, clarity, and cut. A downloadable GIA “quality verification card” then will be available for each diamond in the batch.
A GIA spokesperson told National Jeweler that the batch verification service launched Friday. It is a service GIA is providing for Lightbox only, just as it does pre-owned jewelry authentication for eBay only.
The service will start with the Lightbox’s D-F color white round brilliant-cut loose lab-grown diamonds, though it could expand to the blue and pink lab-grown diamonds in the future.
Lightbox CEO Antoine Borde said: “Lightbox led the lab-grown diamond jewelry sector six years ago with its $800 a carat linear pricing, and, today, we are pleased to introduce even lower prices, that more closely align with current jewelry industry dynamics.
“Equally, we’re very proud to be working with the GIA to verify the quality and consistency of our stones, which supports purchase confidence and allows us to continue our mission of providing clarity, transparency, and value to our customers.”
The Latest

The man was charged with theft, accused of ingesting the necklace while in a jewelry store in Auckland, New Zealand.

The Florida independent expanded its store from 8,000 to 14,000 square feet, fulfilling the vision of its late co-founder, Jim Dunn.

Sponsored by De Beers Group

How Jewelers of America’s 20 Under 40 are leading to ensure a brighter future for the jewelry industry.

The classic 5600 series G-Shock has been scaled down to about a tenth of its size, becoming a fully functioning watch ring.


The association’s annual conference and gala will take place Feb. 4, 2026, during the Tucson gem shows.

The January show will include a workshop for jewelry retailers on implementing AI to strengthen their businesses.

Roseco’s 704-page catalog showcases new lab-grown diamonds, findings, tools & more—available in print or interactive digital editions.

Fellow musician Maxx Morando proposed to the star with a chunky, cushion-cut diamond ring designed by Jacquie Aiche.

The retailer, which sells billions in fine jewelry and watches, is suing the Trump administration and U.S. Customs and Border Patrol.

Black Friday is still the most popular shopping day over the five-day holiday weekend, as per the National Retail Federation’s survey.

The historic egg, crafted for Russia's ruling family prior to the revolution, was the star of Christie’s recent auction of works by Fabergé.

The retailer offered more fashion jewelry priced under $1,000, including lab-grown diamond and men’s jewelry.

The eau de parfum is held in a fluted glass bottle that mirrors the decor of the brand’s atelier, and its cap is a nod to its “Sloan” ring.

Vivek Gadodia and Juan Kemp, who’ve been serving as interim co-CEOs since February, will continue to lead the diamond mining company.

In addition, a slate of new officers and trustees were appointed to the board.

Witt’s Jewelry in Wayne, Nebraska, is the organization’s new milestone member.

Laurs is the editor-in-chief of Gem-A’s The Journal of Gemmology and an expert on the formation of colored gemstone deposits.

The man, who has a criminal history, is suspected of being the fourth member of the four-man crew that carried out the heist.

The single-owner collection includes one of the largest offerings of Verdura jewels ever to appear at auction, said Christie’s.

Michael Helfer has taken the reins, bringing together two historic Chicago jewelry names.

The guide features all-new platinum designs for the holiday season by brands like Harwell Godfrey, Ritani, and Suna.

During its Q3 call, CEO Efraim Grinberg discussed the deal to lower tariffs on Swiss-made watches, watch market trends, and more.

Rosior’s high jewelry cocktail ring with orange sapphires and green diamonds is the perfect Thanksgiving accessory.

The “Embrace Your True Colors” campaign features jewels with a vibrant color palette and poetry by Grammy-nominated artist Aja Monet.

Luxury veteran Alejandro Cuellar has stepped into the role at the Italian fine jewelry brand.

The company gave awards to four students at the Namibia University of Science & Technology, including one who is a Grandview Klein employee.





















