Pink and purple stones were popular in the AGTA’s design competition this year, as were cameos and ocean themes.
Why the Biggest Rough Diamond in a Century Failed to Sell
The CEO of the company that found the 1,109-carat Lesedi la Rona said, “the historical significance of the stone seems to have been missed based on the bids offered.”

London--Even after a lot of publicity and excitement around Lucara’s 1,109-carat Lesedi la Rona rough diamond, the tennis-ball sized stone failed to sell at auction Wednesday.
Discovered at Lucara Diamond Corp.’s Karowe Mine, the stone is the largest rough diamond found since the 3,016.75-carat Cullinan Diamond in 1905.
Lucara said that bidding at the auction at Sotheby’s London did not meet the reserve price--Sotheby’s pre-sale estimate on the stone was $70 million--so it will “retain” the stone for now. The highest bid reached was $61 million, $68.3 million with buyer’s premium.
Lucara CEO and President William Lamb told National Jeweler, “It needs to be understood that this is the first time anyone has attempted to sell a rough diamond via the auction process. Lucara wanted to understand whether there was a market for truly exceptional diamonds where they would be purchased as collectables the same as high-value art.
“We understand that it is not easy to see the true value in a diamond when the only mechanism is to value the polished. The historical significance of the stone seems to have been missed based on the bids offered.”
When asked what role he thought Brexit or other global economic situations might have had on the outcome, he said, “We cannot say. In today’s volatile times, there is always some level of economic uncertainty. Saying this is the reason the auction did not conclude with the sale of the stone would be incorrect, although it may have in some way played a small part.”
When the news first broke that the stone would be put up for auction, Sotheby’s said it commissioned independent reports on the potential yield of Lesedi la Rona from the Gem Certification and Assurance Lab (GCAL) and Diamex Inc./Crodiam Consulting DMCC.
The reports weren’t made public, though a few details were released, including the fact that experts believe that the Lesedi la Rona could yield a polished white diamond that tops the “Great Star of Africa” (530.20 carats) in size.
The reports also stated that there is a “high probability” that the polished diamonds cut from the 1,109-carat rough will be D color.
Aside from its size, the fact that
With the auction having failed, Lamb said there are a number of options available to Lucara, ranging from partnering on the stone to holding a regular tender within the diamond market or putting the stone on display at a museum.
He said with no pressing need to sell the stone, Lucara has time to decide what might be the best route to take.
Aside from Lesedi la Rona, Wednesday’s auction also featured three other pieces of rough, proceeds from the sale of which will go to the Lady Khama Charitable Trust. The trust supports existing charitable organizations working on community development and projects that benefit vulnerable women and children.
All three lots' pre-sale estimates were between $10,000 and $15,000 but came in well above that.
A rough diamond weighing 5.44 carats and octahedron in form garnered $57,500. A 5.62-carat rough diamond of octahedron form went for $42,500, and a third piece of rough weighing 5.78 carats of rhombic dodecahedron form sold for $40,000.
The Latest

All proceeds from the G. St x Jewel Boxing raffle will go to City Harvest, which works to end hunger in New York City.

Courtney Cornell is part of the third generation to lead the Rochester, New York-based jeweler.

From educational programs, advocacy, and recent MJSA affiliation, Jewelers of America drives progress that elevates businesses of all sizes.

Former Signet CEO Mark Light will remain president of Shinola until a replacement for Ulrich Wohn is found.


Kindred Lubeck of Artifex has three rings she designed with Anup Jogani in Sotheby’s upcoming Gem Drop sale.

The company focused on marketing in the third quarter and introduced two new charm collections, “Pandora Talisman” and “Pandora Minis.”

The jewelry retailer raised its full-year guidance, with CFO Jeff Kuo describing the company as “very well positioned” for the holidays.

Ahead of the hearing, two industry organizations co-signed an amicus brief urging the court to declare Trump’s tariffs unlawful.

Stuller COO Belit Myers will take on the additional role of president, with all changes effective at the start of 2026.

Smith cautions retailers against expending too much energy on things they can’t control, like the rising price of gold.

Citrine and topaz are birthstones fit for fall as the leaves change color and the holiday season approaches.

The family-owned jeweler will open its fourth store in Florida in late 2027.

The NYPD is looking for three men who stole a safe and jewelry valued at $3.2 million from the home of a jeweler in Jamaica Hills, Queens.

The trade organization also announced its executive committee and five new directors.

The “Have a Heart x Diamonds Do Good” collection is championed by model and humanitarian Flaviana Matata and will benefit her foundation.

The ring, set with a nearly 17-carat Kashmir cabochon sapphire, sold for $1 million.

This “Mother Father” spinner necklace from Heavenly Vices Fine Jewelry draws inspiration from Victorian Era jewelry.

The suspects were rounded up in Paris and its suburbs on Wednesday night, but none of the stolen jewels were recovered with them.

Experts share top tips on how to encourage positive reviews and handle negative feedback.

Sponsored by the Gemological Institute of America

The suspect faces charges in the August robbery of Menashe & Sons Jewelers and is accused of committing smash and grabs at two pawn shops.

The “Lumière Fine” collection was born from designer Alison Chemla’s interest in the transformative power of light.

Show off your spooky side with these 12 festive jewels.

The “Brilliant & Beyond” panel coincides with the “Love & Marriage” exhibition curated by Davis Jewelers in Louisville, Kentucky.

Consumers are feeling more optimistic about their present situation while the short-term future remains a little scary.























