Our pick of the best objects up for sale in London and New York

Sotheby’s has postponed auction of extraordinary Honresfield Library as a consortium seeks £15 million to buy it

The opulent Palais Oppenheim in Cologne will host exhibitions and sales from September. Sotheby's says move is due to growing client base in country, not Brexit

The work, which took four months to paint in 2002, will be auctioned at Sotheby's this month

Berners-Lee says NFTs are the "ideal way to package the origins behind the web"

The unique coin from 1933, part of a collection amassed by luxury shoe designer, Stuart Weitzman, sold at Sotheby's in New York yesterday

The five figures of Hindu gods once adorned a gilded temple gateway in a Unesco world heritage site

The auction is estimated to raise $3m to $4m to support efforts to end mass incarceration

A museum sells art to balance its budget, a gorgeous Sargent goes unwanted, and a painting of a giraffe reaches high.

Auction at Sotheby’s yields promising yet mixed results for museum’s drive to fund collections care

The sale was led by a classic 1932 Picasso of Marie-Thérèse at $103.4m and set new records for Alice Neel, Grace Hartigan, Barbara Hepworth and Alighiero Boetti

Plus, Heather Phillipson at Tate Britain and Ackroyd and Harvey on Joseph Beuys

Christie's and Sotheby's are starting to embrace what the social media platform has to offer

The evening of sales in New York totalled $439.6m, with Basquiat's Versus Medici topping the contemporary art offering at $50.8m and a new record for Leonor Fini

Sotheby's auction of the Texan rancher's collection totalled $157.2m and set new records for Kenneth Noland, Larry Rivers and Richard Diebenkorn

Pieces came from the collection of late New York heart surgeon who befriended the artist in the 1960s

But the show goes on at Sotheby’s and Christie’s with a mixture of in-person and remote bidding, while British dealers are getting creative in the Big Apple

The $210.4m sale included new highs for contemporary artists like Mickalene Thomas, Jordan Casteel and Lynette Yiadom Boakye, while some established names fell flat

Our pick of the best objects up for sale in New York, Dallas and Paris

The work is expected to fetch up to £12m in a live sale at Christie's London this July

The 17th century painting of the Earl of Strafford, recently discovered to have been in the Royal collection, is expected to sell for up to £5m in London in July

Painting is the only surviving contemporary image of the monarch

The Stand has been launched by former Sotheby's boss and will give 70% to artists, 20% to charity

The sale this month will be the first time the auction house has accepted cryptocurrency as payment for a physical work of art

The artist, writer and dealer is selling a selection of bizarre pieces from his London-based Museum of Curiosities on 6 May

Editions of the Anyanwu sculpture always attract attention at auction, but the legacy of the work and its maker are largely ignored both in his home country and the international art scene

The collection of 18th-century porcelain was previously exhibited in Dutch museums

Charity sale is in aid of Sheikh Mohammed bin Rashid Al Maktoum's "100 Million Meals" campaign

It could become the most expensive Asian work sold by a Western auction house. Meanwhile, young contemporary names proved popular at last night's Sotheby's sale in Hong Kong

Sometimes the wistful memory of time long past is all one needs to spend a few hundred thousand.