RAPAPORT… A polished stone weighing more than 20 carats has become the most expensive diamond ever sold at an auction in Australia, fetching AUD 1.6 million ($1.2 million), according to the company that carried out the sale.
The emerald-cut, 20.05-carat, H-color, VVS2-clarity diamond, set in a ring, beat its presale high estimate of AUD 1.5 million ($1.1 million) at the December 7 Important Jewels sale in Sydney, Leonard Joel said.
“The ring was greatly admired at the viewings in Melbourne and Sydney,” the Australia-based company noted. “It was sold to a local buyer who bid in the room after they had fallen in love with the piece at the viewing earlier the same day.”
Leonard Joel holds the record for the four most expensive diamonds purchased at auction in Australia, it said. In April, the company sold a 25.02-carat diamond ring for AUD 1.1 million ($801,569). Meanwhile, a ring set with a 9.67-carat, fancy-pink diamond from the Argyle mine went for AUD 725,000 ($516,567) and a 17.34-carat diamond ring brought in AUD 575,000 ($409,691).
In total, Leonard Joel banked AUD 9.8 million ($7 million) from its Important Jewels sales this year.
Image: The 20.05-carat diamond ring. (Leonard Joel)
20ct. Diamond Breaks Record in Australia
The Bottom Line
- The 20.05-carat, H-color, VVS2-clarity emerald-cut diamond ring sold for AUD 1.6 million, surpassing its presale estimate of AUD 1.5 million.
- Leonard Joel holds the record for the four most expensive diamond auctions in Australia, including a 25.02-carat diamond sold for AUD 1.1 million earlier this year.
- The company generated AUD 9.8 million ($7 million) in total sales from its Important Jewels auctions in 2023.
Summary by Rapaport AI
More Stories

CIBJO Sticks with ‘Synthetics’ Moniker Despite Industry Pushback
Organization received letter from group of senior trade members requesting a deferral of final decision.

Gareth Penny Calls for Stronger Natural-Diamond Marketing
Industry must create emotive campaigns to connect with the next generation of consumers, he says.

Gem and Diamond Parure Takes Top Spot at Bonhams
Mouawad set sells for $78,200, below its $153,000 high estimate.
