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TEFAF is to trial its own online selling platform at the fair organisation’s autumn New York event, with a view to building a permanent e-commerce presence.

The number of art dealers specialising in modern and contemporary art in central London is growing, and outstripping dealers in period work.

A round-up of art and antiques news from the previous seven days.

For previous generations of artist jewellers, from René Lalique to Andrew Grima, retail sales and private commissions were everything. Typically it was only much later in the collecting lifecycle, after a period of posthumous reassessment and rediscovery, that their work appeared at auction with any great regularity.

Ahead of the autumn sale of a star lot, Phillips' watch expert Aurel Bacs tells ATG why the time is right for the firm to expand its US watch business

The “oldest mathematical textbook still in common use today”, according to Printing and the Mind of man, is that written around 300BC by the Greek mathematician, Euclid of Alexandria.

ATG’s weekly selection of items on sale at auctions and dealerships.

Dendritic agate – a pale chalcedony with treelike inclusions caused by traces of iron or manganese – is a relatively lowly stone but was a favourite of Russian jewellers in particular. Carl Fabergé used it in many pieces in a country where it is considered a stone of longevity, good health and prosperity.

A selection of stand-out jewellery lots from regional auctions.

A “jewel-like” painting of a young girl reading by Edward Frampton (1870-1932) starred in Dominic Winter’s (19.5% buyer’s premium) June 15 sale.

One of the odder lots I have stumbled across in the many June book sales is a worn and soiled 12pp autograph catalogue, or calendar of “35 nude male races held on Kersal Moor [near Manchester] between 1777 and 1811”.

ATG’s selection of auction lots bought by internet bidders on thesaleroom.com from the period June 22-28, 2017. This includes both the highest prices over estimate and the top prices paid online.

The collection of Tiffany jewels offered by Christie’s New York (25/20/12% buyer’s premium) on June 20 was the finest at auction in recent memory.

Bonhams’ (25/20/12% buyer’s premium) sale in Knightsbridge on June 14 included a group of pieces attributed to the British Arts & Crafts jeweller and designer Dorrie Nossiter (1893-1977).

Art books in a Ketterer Kunst (20% buyer’s premium) sale of May 22 included one of 15 deluxe copies of a 1950 edition of Harry Roskolenko’s Paris Poems, containing an original watercolour by Zau Wou-Ki and an extra suite of his lithographed illustrations. It sold at €42,000 (£36,240).

Stealing all the headlines at Sotheby’s (25/20/12% buyer’s premium) Fine Jewels sale in London on June 7 was the £540,000, 26ct ’tenner’ diamond, bought by the vendor at a boot fair in the 1980s. However, among the 370 lots were items with more illustrious provenances.

A London street view by the northern English artist Harry Rutherford (1903-85) led the sale at Chiswick Auctions (22% buyer’s premium) on June 13.

Promoted in a catalogue issued by Fonsie Mealy (20/25% buyer’s premium) for its May 20 sale as something “for the collector who has (almost) everything”, an autograph section from James Joyce’s Finnegan’s Wake was sold at €27,000 (£23,480).

Agatha Christie’s books were much in evidence at a Keys (17.5% buyer’s premium) sale of June 7-8, among them a 1921 first of The Mysterious Affair at Styles.

A festival to help raise funds for the victims of the Grenfell Tower fire in London and their families will run at Windsor Racecourse on Saturday, September 23.