Christie’s to auction portrait of John Frederick the Magnanimous in New York next month

The release of a pre-conservation image of Leonardo’s $450m Salvator Mundi reignites debate over the transparency of conservators’ interventions

We spoke to a few specialists about the jewellery trade ahead of the fair

Buccaneering, brilliant, art-loving—he created the power of Sotheby’s (and Christie’s learned by imitation)

Christie’s and Sotheby’s dominate in terms of value but smaller firms can compete in the field of Asian art, with the internet’s help

Buyer bidding through advisors Gurr Johns, combined with strong Asian interest, buoys London Impressionist and Modern art sales at Christie's and Sotheby's

From the Deutsche Börse photography prize to Rockefeller's collection including Gauguin and Picasso

We talk to the American dynasty’s historian about David and Peggy Rockefeller’s tastes, and explore the funding crisis at Glasgow’s Transmission Gallery

Christie's sale of 46 works from La Salle collection will diminish the museum and its academic programme

The increase comes from a rise in new online buyers and one very expensive Leonardo

Mousquetaire et nu assis is among highlights of London evening sale of Modern and Impressionist art in February

Flaky winning bids are knocking the gloss off record-breaking sales

$450m Salvator Mundi sale too late to be included in new book, The Orange Balloon Dog, but would have filled several chapters, economist says

We talk Titian, Constable, Veneziano, Wright of Derby, Van Dyck and, yes, Leonardo, with art historian Bendor Grosvenor. And we get Judd Tully’s views on Miami’s annual art fair.

Gesture consolidates close political alliance between Saudi Arabia and the UAE

Rothschild's El Greco, a candlelit scene by Joseph Wright of Derby and an out of season crucifixion scene lead pre-Christmas sales

Slick marketing produced stupendous sale price for Salvator Mundi, but it sparked revulsion as well as elation

Martin Gammon on the historical precedents of the $450m sale

Rumour mill has gone into overdrive over record-breaking auction

Export bar placed on plush piece with asking price of more than £480,000

A growing number of women are appearing on the rostrum and taking senior auctioneer roles

Thomas Campbell posted an image of the Salvator Mundi before conservation, triggering a row with its former co-owner Robert Simon and Christie’s Loic Gouzer

BUM was created just before Boty died of cancer aged 28 in 1966

How the art sale of the century happened, with Judd Tully, our man in the salesroom. Plus, a new museum in Indonesia

Despite buy-ins, the sale saw several strong prices and records below the dizzy height of $450.3m for Leonardo da Vinci's Salvator Mundi

Price makes it the most expensive painting of all time

Painting is being presented by Christie’s as the “Holy Grail of Old Master paintings”

Pre-auction assessment offers evidence that painting is original Leonardo but also reveals problems posed by painting’s wooden panel

Salvator Mundi will break Old Master auction record as seller dispute rumbles on