RAPAPORT… Bonhams will offer an 18.04-carat diamond at its Fine
Jewelry sale in New York next month, estimating the piece at $400,000 to
$600,000.
The emerald-cut, G-color, VS2-clarity diamond flanked by
trillion-cut diamonds will head up the auction on December 3 at the company’s
Madison Avenue location, Bonhams said Thursday.
“This is a beautiful example of a large, white diamond
exhibiting sensational fire and cut,” said Caroline Morrissey, senior jewelry
specialist at Bonhams New York. “It comes from a private collection, and [this]
will be the first time it has appeared at auction.”
The sale will also feature a ring containing a
rectangular-shaped, emerald-cut, 33.03-carat Sri Lankan (or Ceylon) sapphire
flanked by a combined 1.25 carats of baguette-cut diamonds. Bonhams expects it
to fetch $250,000 to $350,000.
Image: An 18.04-carat diamond ring that Bonhams will auction in New York. (Bonhams)
18ct. Diamond to Lead Bonhams Auction
The Bottom Line
- The 18.04-carat diamond is G-color, VS2 clarity, and emerald-cut, accompanied by trillion-cut diamonds.
- This diamond is from a private collection and will appear at auction for the first time.
- The sale also includes a 33.03-carat rectangular emerald-cut Sri Lankan sapphire ring, estimated at $250,000 to $350,000.
Summary by Rapaport AI
More Stories

Qatar Diamond Exchange to Collaborate with Italian Bourse
Parties signed MoU to extend connection among their members, broaden cooperation and advance commercial relationships.

China Signs Deal to Reinvigorate Interest in Natural Diamonds
Shanghai Diamond Exchange hosts signing of Beijing Declaration, with government representatives from Botswana, Namibia and South Africa.

AI, Gen Z Are Hot Topics at AGS Conclave
This year’s edition is last to take place in September, as event returns to spring in 2027.
