This is how two diamonds over 100 carats were sold at auction

New York—Sotheby’s recently auctioned two diamonds over 100 carats, with mixed results.

At the auction house’s ‘Magnificent Jewels’ sale on June 16 in New York, the highlight lot was the stone previously known as ‘The Juno Diamond’, a Type IIa diamond, 101.41 carats , color D, without internal defect.

Sotheby’s estimated it would sell for over $10 million. The stone fetched around $13 million, or about $127,800 per carat, one of the highest prices paid for a D, F or IF color diamond over 100 carats at auction, according to Sotheby’s.

The private collector who bought the stone renamed it “Claire G Diamond” after his wife, the auction house said.

The other big diamond Sotheby’s put on the block was “The Earth Star”, a 111.59 carat fancy deep orange-brown diamond.

Sotheby’s offered the diamond, seen below, without reserve, estimating it would sell for between $1.5 million and $2.5 million. Its final price was well below that – $693,000.

The auction house said it was the second-largest cut and polished brown diamond to be auctioned, and one of only three such stones weighing more than 100 carats ever to be auctioned. put up for sale.

The stone made an appearance in the 1968 book “Famous Diamonds” by Lord Ian Balfour.

The rough version, weighing 248 carats, was discovered the previous year at the Jagersfontein mine in South Africa.

“The Earth Star,” a fancy 111.59-carat deep orange-brown diamond set in a necklace by David Webb, fetched $693,000 at auction, less than half of its lowest pre-sale estimate.


The Baumgold brothers in New York cut and polished the pear-shaped stone and named it The Earth Star for its brilliance.

David Webb set it in a pendant with azure malachite (a mixture of azurite and malachite), diamonds and gold, highlighting its origin below the Earth’s surface.

In 1983, The Earth Star sold for almost a million dollars and remained in private ownership until its auction at Sotheby’s.

Other notable highlights of the sale included Lot No. 2, a 4.08-carat old-mine-cut fancy intense pink diamond that fetched nearly double its pre-sale high estimate, selling $3.8 million.

Next, at No. 3, a ring from Kwiat centered on a 26.06 carat D-color VVS1 clarity diamond, which was within its pre-sale estimate range when it fetched 2.3 million dollars.

A 3.46-carat old-cut fancy grey-violet diamond fetched more than double its pre-sale estimate when it sold for nearly $2 million.

A necklace with a 10.31-carat modified triangular brilliant-cut Paraiba tourmaline and diamond accents was also well above pre-sale forecasts, selling for $1.2 million.

The June 16 “Magnificent Jewels” auction totaled more than $52 million. To see the full results, visit Sothebys.com.

The results, along with the New York Fine Jewels sale also held last week, pushed global Sotheby’s jewelry auctions to more than $230 million to date, which it says represents a 14% increase over compared to the same period in 2021.

Sarah C. Figueiredo